322753
Assertion : \({\text{p}}\)-Dichlorobenzene has higher melting point than o-dichlorobenzene. Reason : Stronger the van der Waals' forces of attraction, higher is the melting point.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The para-isomer of dichlorobenzene being symmetrical exhibits a closed packing arrangement within the crystal lattice. Consequently, it possesses a much higher melting point compared to the \(\mathrm{o}\) - and \(\mathrm{m}\) - isomers melting point depends on Vander waal's forces also. So option (2) is correct.
CHXII10:HALOALKANES AND HALOARENES
322754
Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane
Higher the surface area, higher will be the intermolecular forces of attraction and thus boilingpoint too. Boiling point increases with increase in molecular mass of halogen atom for the similar type of alkyl halide. Butane has no halogen atom and rest of all three compounds are halo derivatives of butane. Atomic mass of iodine is the highest so the boiling point of 1-Iodobutane is maximum among all the given compounds and hence, option (1) is correct.
NCERT Exemplar
CHXII10:HALOALKANES AND HALOARENES
322755
Consider the following haloarenes,
(I) B.P. of II is more than that of I. (II) B.P. of II is least among the given. (III) M.P. of III is highest among the given. (IV) M.P. of I is greater than that of II. Choose the correct option.
1 Only I
2 II, III, and IV
3 Only IV
4 Both I and IV
Explanation:
(III) is symmetrical; thus, due to excellent packaging, it has the highest melting and boiling points, while (I) has more dipole than (II) Hence, melting and boiling points follow the order: III \({\mathrm{>}}\) I \({\mathrm{>}}\) II. So statements (ii) is incorrect.
CHXII10:HALOALKANES AND HALOARENES
322756
Which of the following compound possesses highest melting point?
1 o-Dichlorobenzene
2 p-Dichlorobenzene
3 m-Dichlorobenzene
4 All have same M.P.
Explanation:
Para isomer is more symmetrical and hence its molecules pack closely in the crystal lattice.
CHXII10:HALOALKANES AND HALOARENES
322757
Assertion : Boiling point of \(\mathrm{RCl}\) is greater than RF. Reason : \(\mathrm{R}-\mathrm{Cl}\) is more stable than \(\mathrm{R}-\mathrm{F}\).
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
For the same alkyl group, the boiling points are in the order \(\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}\). This is because with the increase in the size of halogen, the magnitude of van der Waals' force increases and boiling point increases.Bond strength decreases as the size of the halogen increases \(\mathrm{CH}_{3} \mathrm{~F}>\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{I}\) is stability order. So option (3) is correct.
322753
Assertion : \({\text{p}}\)-Dichlorobenzene has higher melting point than o-dichlorobenzene. Reason : Stronger the van der Waals' forces of attraction, higher is the melting point.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The para-isomer of dichlorobenzene being symmetrical exhibits a closed packing arrangement within the crystal lattice. Consequently, it possesses a much higher melting point compared to the \(\mathrm{o}\) - and \(\mathrm{m}\) - isomers melting point depends on Vander waal's forces also. So option (2) is correct.
CHXII10:HALOALKANES AND HALOARENES
322754
Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane
Higher the surface area, higher will be the intermolecular forces of attraction and thus boilingpoint too. Boiling point increases with increase in molecular mass of halogen atom for the similar type of alkyl halide. Butane has no halogen atom and rest of all three compounds are halo derivatives of butane. Atomic mass of iodine is the highest so the boiling point of 1-Iodobutane is maximum among all the given compounds and hence, option (1) is correct.
NCERT Exemplar
CHXII10:HALOALKANES AND HALOARENES
322755
Consider the following haloarenes,
(I) B.P. of II is more than that of I. (II) B.P. of II is least among the given. (III) M.P. of III is highest among the given. (IV) M.P. of I is greater than that of II. Choose the correct option.
1 Only I
2 II, III, and IV
3 Only IV
4 Both I and IV
Explanation:
(III) is symmetrical; thus, due to excellent packaging, it has the highest melting and boiling points, while (I) has more dipole than (II) Hence, melting and boiling points follow the order: III \({\mathrm{>}}\) I \({\mathrm{>}}\) II. So statements (ii) is incorrect.
CHXII10:HALOALKANES AND HALOARENES
322756
Which of the following compound possesses highest melting point?
1 o-Dichlorobenzene
2 p-Dichlorobenzene
3 m-Dichlorobenzene
4 All have same M.P.
Explanation:
Para isomer is more symmetrical and hence its molecules pack closely in the crystal lattice.
CHXII10:HALOALKANES AND HALOARENES
322757
Assertion : Boiling point of \(\mathrm{RCl}\) is greater than RF. Reason : \(\mathrm{R}-\mathrm{Cl}\) is more stable than \(\mathrm{R}-\mathrm{F}\).
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
For the same alkyl group, the boiling points are in the order \(\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}\). This is because with the increase in the size of halogen, the magnitude of van der Waals' force increases and boiling point increases.Bond strength decreases as the size of the halogen increases \(\mathrm{CH}_{3} \mathrm{~F}>\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{I}\) is stability order. So option (3) is correct.
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CHXII10:HALOALKANES AND HALOARENES
322753
Assertion : \({\text{p}}\)-Dichlorobenzene has higher melting point than o-dichlorobenzene. Reason : Stronger the van der Waals' forces of attraction, higher is the melting point.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The para-isomer of dichlorobenzene being symmetrical exhibits a closed packing arrangement within the crystal lattice. Consequently, it possesses a much higher melting point compared to the \(\mathrm{o}\) - and \(\mathrm{m}\) - isomers melting point depends on Vander waal's forces also. So option (2) is correct.
CHXII10:HALOALKANES AND HALOARENES
322754
Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane
Higher the surface area, higher will be the intermolecular forces of attraction and thus boilingpoint too. Boiling point increases with increase in molecular mass of halogen atom for the similar type of alkyl halide. Butane has no halogen atom and rest of all three compounds are halo derivatives of butane. Atomic mass of iodine is the highest so the boiling point of 1-Iodobutane is maximum among all the given compounds and hence, option (1) is correct.
NCERT Exemplar
CHXII10:HALOALKANES AND HALOARENES
322755
Consider the following haloarenes,
(I) B.P. of II is more than that of I. (II) B.P. of II is least among the given. (III) M.P. of III is highest among the given. (IV) M.P. of I is greater than that of II. Choose the correct option.
1 Only I
2 II, III, and IV
3 Only IV
4 Both I and IV
Explanation:
(III) is symmetrical; thus, due to excellent packaging, it has the highest melting and boiling points, while (I) has more dipole than (II) Hence, melting and boiling points follow the order: III \({\mathrm{>}}\) I \({\mathrm{>}}\) II. So statements (ii) is incorrect.
CHXII10:HALOALKANES AND HALOARENES
322756
Which of the following compound possesses highest melting point?
1 o-Dichlorobenzene
2 p-Dichlorobenzene
3 m-Dichlorobenzene
4 All have same M.P.
Explanation:
Para isomer is more symmetrical and hence its molecules pack closely in the crystal lattice.
CHXII10:HALOALKANES AND HALOARENES
322757
Assertion : Boiling point of \(\mathrm{RCl}\) is greater than RF. Reason : \(\mathrm{R}-\mathrm{Cl}\) is more stable than \(\mathrm{R}-\mathrm{F}\).
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
For the same alkyl group, the boiling points are in the order \(\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}\). This is because with the increase in the size of halogen, the magnitude of van der Waals' force increases and boiling point increases.Bond strength decreases as the size of the halogen increases \(\mathrm{CH}_{3} \mathrm{~F}>\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{I}\) is stability order. So option (3) is correct.
322753
Assertion : \({\text{p}}\)-Dichlorobenzene has higher melting point than o-dichlorobenzene. Reason : Stronger the van der Waals' forces of attraction, higher is the melting point.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The para-isomer of dichlorobenzene being symmetrical exhibits a closed packing arrangement within the crystal lattice. Consequently, it possesses a much higher melting point compared to the \(\mathrm{o}\) - and \(\mathrm{m}\) - isomers melting point depends on Vander waal's forces also. So option (2) is correct.
CHXII10:HALOALKANES AND HALOARENES
322754
Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane
Higher the surface area, higher will be the intermolecular forces of attraction and thus boilingpoint too. Boiling point increases with increase in molecular mass of halogen atom for the similar type of alkyl halide. Butane has no halogen atom and rest of all three compounds are halo derivatives of butane. Atomic mass of iodine is the highest so the boiling point of 1-Iodobutane is maximum among all the given compounds and hence, option (1) is correct.
NCERT Exemplar
CHXII10:HALOALKANES AND HALOARENES
322755
Consider the following haloarenes,
(I) B.P. of II is more than that of I. (II) B.P. of II is least among the given. (III) M.P. of III is highest among the given. (IV) M.P. of I is greater than that of II. Choose the correct option.
1 Only I
2 II, III, and IV
3 Only IV
4 Both I and IV
Explanation:
(III) is symmetrical; thus, due to excellent packaging, it has the highest melting and boiling points, while (I) has more dipole than (II) Hence, melting and boiling points follow the order: III \({\mathrm{>}}\) I \({\mathrm{>}}\) II. So statements (ii) is incorrect.
CHXII10:HALOALKANES AND HALOARENES
322756
Which of the following compound possesses highest melting point?
1 o-Dichlorobenzene
2 p-Dichlorobenzene
3 m-Dichlorobenzene
4 All have same M.P.
Explanation:
Para isomer is more symmetrical and hence its molecules pack closely in the crystal lattice.
CHXII10:HALOALKANES AND HALOARENES
322757
Assertion : Boiling point of \(\mathrm{RCl}\) is greater than RF. Reason : \(\mathrm{R}-\mathrm{Cl}\) is more stable than \(\mathrm{R}-\mathrm{F}\).
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
For the same alkyl group, the boiling points are in the order \(\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}\). This is because with the increase in the size of halogen, the magnitude of van der Waals' force increases and boiling point increases.Bond strength decreases as the size of the halogen increases \(\mathrm{CH}_{3} \mathrm{~F}>\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{I}\) is stability order. So option (3) is correct.
322753
Assertion : \({\text{p}}\)-Dichlorobenzene has higher melting point than o-dichlorobenzene. Reason : Stronger the van der Waals' forces of attraction, higher is the melting point.
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
The para-isomer of dichlorobenzene being symmetrical exhibits a closed packing arrangement within the crystal lattice. Consequently, it possesses a much higher melting point compared to the \(\mathrm{o}\) - and \(\mathrm{m}\) - isomers melting point depends on Vander waal's forces also. So option (2) is correct.
CHXII10:HALOALKANES AND HALOARENES
322754
Which is the correct increasing order of boiling points of the following compounds? 1-Iodobutane, 1-Bromobutane, 1-Chlorobutane, Butane
Higher the surface area, higher will be the intermolecular forces of attraction and thus boilingpoint too. Boiling point increases with increase in molecular mass of halogen atom for the similar type of alkyl halide. Butane has no halogen atom and rest of all three compounds are halo derivatives of butane. Atomic mass of iodine is the highest so the boiling point of 1-Iodobutane is maximum among all the given compounds and hence, option (1) is correct.
NCERT Exemplar
CHXII10:HALOALKANES AND HALOARENES
322755
Consider the following haloarenes,
(I) B.P. of II is more than that of I. (II) B.P. of II is least among the given. (III) M.P. of III is highest among the given. (IV) M.P. of I is greater than that of II. Choose the correct option.
1 Only I
2 II, III, and IV
3 Only IV
4 Both I and IV
Explanation:
(III) is symmetrical; thus, due to excellent packaging, it has the highest melting and boiling points, while (I) has more dipole than (II) Hence, melting and boiling points follow the order: III \({\mathrm{>}}\) I \({\mathrm{>}}\) II. So statements (ii) is incorrect.
CHXII10:HALOALKANES AND HALOARENES
322756
Which of the following compound possesses highest melting point?
1 o-Dichlorobenzene
2 p-Dichlorobenzene
3 m-Dichlorobenzene
4 All have same M.P.
Explanation:
Para isomer is more symmetrical and hence its molecules pack closely in the crystal lattice.
CHXII10:HALOALKANES AND HALOARENES
322757
Assertion : Boiling point of \(\mathrm{RCl}\) is greater than RF. Reason : \(\mathrm{R}-\mathrm{Cl}\) is more stable than \(\mathrm{R}-\mathrm{F}\).
1 Both Assertion and Reason are correct and Reason is the correct explanation of the Assertion.
2 Both Assertion and Reason are correct but Reason is not the correct explanation of the Assertion.
3 Assertion is correct but Reason is incorrect.
4 Assertion is incorrect but Reason is correct.
Explanation:
For the same alkyl group, the boiling points are in the order \(\mathrm{RI}>\mathrm{RBr}>\mathrm{RCl}>\mathrm{RF}\). This is because with the increase in the size of halogen, the magnitude of van der Waals' force increases and boiling point increases.Bond strength decreases as the size of the halogen increases \(\mathrm{CH}_{3} \mathrm{~F}>\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{I}\) is stability order. So option (3) is correct.
