NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXI13:HYDROCARBONS
318347
A gaseous mixture containing two hydrocarbons X & Y of volume 44.8 lit (STP) when passed through ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) has suffered reduction in volume of about 11.2 lit. If remaining volume is due to \(\mathrm{Y}, \mathrm{X}\) is
1 But-2-yne
2 Ethene
3 Ethane
4 Propyne
Explanation:
Ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) reacts with terminal alkynes containing acidic hydrogens and form alkynides. But-2-yne is not terminal alkyne but Propyne is terminal alkyne, reacts with reagent.
CHXI13:HYDROCARBONS
318348
Assertion : Alkynes are more reactive than alkenes towards catalytic hydrogenation Reason : Alkynes are less reactive towards electrophilic reaction than alkenes
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:
Alkynes are more reactive than alkenes towards catalytic hydrogenation because they are more easily adsorbed on the catalytic surface due to less steric hinderance around the multiple bonds. Alkynes are less reactive than alkenes towards electrophilic substitution because the pi electrons are tightly held in the more compact triple bond as compared to a double bond. Thus, both assertion and reason are true but reason is the correct explanation of the assertion.
CHXI13:HYDROCARBONS
318349
Assertion : Both cyclopropane and propene give addition reactions readily. Reason : Cyclopropane and propene are isomers of each other.
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:
Propene being unsaturated undergoes addition reactions, and cyclopropane being strained readily undergoes ring cleavage to yield addition products. Both these have same molecular formula, So can be called as ring chain isomers. Therefore, option (2) is correct.
CHXI13:HYDROCARBONS
318350
Assertion : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\) Reason : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)has more s-character than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\).
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:
\(\mathrm{HC} \equiv \mathrm{C}^{-}\)has \(50 \%\) s-character and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\)has \(33 \%\) s-character in hybrid orbitals . Stability of carbanions increases with an increase in the s- character at the carbon containing negative charge (carbanion). So, \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\). So, option (1) is correct.
318347
A gaseous mixture containing two hydrocarbons X & Y of volume 44.8 lit (STP) when passed through ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) has suffered reduction in volume of about 11.2 lit. If remaining volume is due to \(\mathrm{Y}, \mathrm{X}\) is
1 But-2-yne
2 Ethene
3 Ethane
4 Propyne
Explanation:
Ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) reacts with terminal alkynes containing acidic hydrogens and form alkynides. But-2-yne is not terminal alkyne but Propyne is terminal alkyne, reacts with reagent.
CHXI13:HYDROCARBONS
318348
Assertion : Alkynes are more reactive than alkenes towards catalytic hydrogenation Reason : Alkynes are less reactive towards electrophilic reaction than alkenes
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:
Alkynes are more reactive than alkenes towards catalytic hydrogenation because they are more easily adsorbed on the catalytic surface due to less steric hinderance around the multiple bonds. Alkynes are less reactive than alkenes towards electrophilic substitution because the pi electrons are tightly held in the more compact triple bond as compared to a double bond. Thus, both assertion and reason are true but reason is the correct explanation of the assertion.
CHXI13:HYDROCARBONS
318349
Assertion : Both cyclopropane and propene give addition reactions readily. Reason : Cyclopropane and propene are isomers of each other.
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:
Propene being unsaturated undergoes addition reactions, and cyclopropane being strained readily undergoes ring cleavage to yield addition products. Both these have same molecular formula, So can be called as ring chain isomers. Therefore, option (2) is correct.
CHXI13:HYDROCARBONS
318350
Assertion : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\) Reason : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)has more s-character than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\).
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:
\(\mathrm{HC} \equiv \mathrm{C}^{-}\)has \(50 \%\) s-character and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\)has \(33 \%\) s-character in hybrid orbitals . Stability of carbanions increases with an increase in the s- character at the carbon containing negative charge (carbanion). So, \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\). So, option (1) is correct.
318347
A gaseous mixture containing two hydrocarbons X & Y of volume 44.8 lit (STP) when passed through ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) has suffered reduction in volume of about 11.2 lit. If remaining volume is due to \(\mathrm{Y}, \mathrm{X}\) is
1 But-2-yne
2 Ethene
3 Ethane
4 Propyne
Explanation:
Ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) reacts with terminal alkynes containing acidic hydrogens and form alkynides. But-2-yne is not terminal alkyne but Propyne is terminal alkyne, reacts with reagent.
CHXI13:HYDROCARBONS
318348
Assertion : Alkynes are more reactive than alkenes towards catalytic hydrogenation Reason : Alkynes are less reactive towards electrophilic reaction than alkenes
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:
Alkynes are more reactive than alkenes towards catalytic hydrogenation because they are more easily adsorbed on the catalytic surface due to less steric hinderance around the multiple bonds. Alkynes are less reactive than alkenes towards electrophilic substitution because the pi electrons are tightly held in the more compact triple bond as compared to a double bond. Thus, both assertion and reason are true but reason is the correct explanation of the assertion.
CHXI13:HYDROCARBONS
318349
Assertion : Both cyclopropane and propene give addition reactions readily. Reason : Cyclopropane and propene are isomers of each other.
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:
Propene being unsaturated undergoes addition reactions, and cyclopropane being strained readily undergoes ring cleavage to yield addition products. Both these have same molecular formula, So can be called as ring chain isomers. Therefore, option (2) is correct.
CHXI13:HYDROCARBONS
318350
Assertion : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\) Reason : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)has more s-character than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\).
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:
\(\mathrm{HC} \equiv \mathrm{C}^{-}\)has \(50 \%\) s-character and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\)has \(33 \%\) s-character in hybrid orbitals . Stability of carbanions increases with an increase in the s- character at the carbon containing negative charge (carbanion). So, \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\). So, option (1) is correct.
318347
A gaseous mixture containing two hydrocarbons X & Y of volume 44.8 lit (STP) when passed through ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) has suffered reduction in volume of about 11.2 lit. If remaining volume is due to \(\mathrm{Y}, \mathrm{X}\) is
1 But-2-yne
2 Ethene
3 Ethane
4 Propyne
Explanation:
Ammoniacal \(\mathrm{Cu}_{2} \mathrm{Cl}_{2}\) reacts with terminal alkynes containing acidic hydrogens and form alkynides. But-2-yne is not terminal alkyne but Propyne is terminal alkyne, reacts with reagent.
CHXI13:HYDROCARBONS
318348
Assertion : Alkynes are more reactive than alkenes towards catalytic hydrogenation Reason : Alkynes are less reactive towards electrophilic reaction than alkenes
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:
Alkynes are more reactive than alkenes towards catalytic hydrogenation because they are more easily adsorbed on the catalytic surface due to less steric hinderance around the multiple bonds. Alkynes are less reactive than alkenes towards electrophilic substitution because the pi electrons are tightly held in the more compact triple bond as compared to a double bond. Thus, both assertion and reason are true but reason is the correct explanation of the assertion.
CHXI13:HYDROCARBONS
318349
Assertion : Both cyclopropane and propene give addition reactions readily. Reason : Cyclopropane and propene are isomers of each other.
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:
Propene being unsaturated undergoes addition reactions, and cyclopropane being strained readily undergoes ring cleavage to yield addition products. Both these have same molecular formula, So can be called as ring chain isomers. Therefore, option (2) is correct.
CHXI13:HYDROCARBONS
318350
Assertion : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\) Reason : \(\mathrm{HC} \equiv \mathrm{C}^{-}\)has more s-character than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\).
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:
\(\mathrm{HC} \equiv \mathrm{C}^{-}\)has \(50 \%\) s-character and \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\)has \(33 \%\) s-character in hybrid orbitals . Stability of carbanions increases with an increase in the s- character at the carbon containing negative charge (carbanion). So, \(\mathrm{HC} \equiv \mathrm{C}^{-}\)is more stable than \(\mathrm{H}_{2} \mathrm{C}=\mathrm{CH}^{-}\). So, option (1) is correct.
