NEET Test Series from KOTA - 10 Papers In MS WORD
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CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323056
Which among the following compounds has highest melting point?
1 tert-Butyl alcohol
2 n-Butyl alcohol
3 Isobutyl alcohol
4 sec-Butyl alcohol
Explanation:
tert - Butyl alcohol has a much higher melting point becuase of its symmetrical close packed structure than remaining.
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323057
Assertion : Methyl alcohol is more volatile than water. Reason : The oxygen containing angle is maximum in water than methanol.
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:
In the case of methanol \(\left(\mathrm{CH}_{3} \mathrm{OH}\right)\) and water \(\left(\mathrm{H}_{2} \mathrm{O}\right)\),the oxygen atom is \(\mathrm{sp}^{3}\) hybridized. The larger size of the \(\mathrm{CH}_{3}\) group in methanol compared to a single hydrogen atom results in greater steric hindrance. While there are lone pair-lone pair repulsions, these are outweighed by the steric hindrance from the larger \(\mathrm{CH}_{3}\) group. As a result, the angle between the oxygen atom and other atoms in methanol is greater compared to that in water. So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323058
Which of the following has lowest boiling point?
1 p-Nitrophenol
2 m-Nitrophenol
3 o-Nitrophenol
4 Phenol
Explanation:
o-Nitrophenol has intramolecular H- bonding. So, B.P. is low.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323059
Select the incorrect option from the following regarding the physical properties of alcohols and phenols.
1 The boiling points of alcohols and phenols are higher in comparison to hydrocarbons, ethers, haloalkanes and haloarenes of comparable molecular masses.
2 Ethanol and propane have comparable boiling points but differ only in the molecular masses.
3 The - OH group in alcohols and phenols is involved in the intermolecular hydrogen bonding.
4 The trend of boiling points is ethanol \(>\) methoxymethane > propane.
Explanation:
Ethanol and propane have different boiling points but comparable molecular masses. Ethanol has higher boiling point than propane because of H - bonding.
323056
Which among the following compounds has highest melting point?
1 tert-Butyl alcohol
2 n-Butyl alcohol
3 Isobutyl alcohol
4 sec-Butyl alcohol
Explanation:
tert - Butyl alcohol has a much higher melting point becuase of its symmetrical close packed structure than remaining.
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323057
Assertion : Methyl alcohol is more volatile than water. Reason : The oxygen containing angle is maximum in water than methanol.
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:
In the case of methanol \(\left(\mathrm{CH}_{3} \mathrm{OH}\right)\) and water \(\left(\mathrm{H}_{2} \mathrm{O}\right)\),the oxygen atom is \(\mathrm{sp}^{3}\) hybridized. The larger size of the \(\mathrm{CH}_{3}\) group in methanol compared to a single hydrogen atom results in greater steric hindrance. While there are lone pair-lone pair repulsions, these are outweighed by the steric hindrance from the larger \(\mathrm{CH}_{3}\) group. As a result, the angle between the oxygen atom and other atoms in methanol is greater compared to that in water. So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323058
Which of the following has lowest boiling point?
1 p-Nitrophenol
2 m-Nitrophenol
3 o-Nitrophenol
4 Phenol
Explanation:
o-Nitrophenol has intramolecular H- bonding. So, B.P. is low.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323059
Select the incorrect option from the following regarding the physical properties of alcohols and phenols.
1 The boiling points of alcohols and phenols are higher in comparison to hydrocarbons, ethers, haloalkanes and haloarenes of comparable molecular masses.
2 Ethanol and propane have comparable boiling points but differ only in the molecular masses.
3 The - OH group in alcohols and phenols is involved in the intermolecular hydrogen bonding.
4 The trend of boiling points is ethanol \(>\) methoxymethane > propane.
Explanation:
Ethanol and propane have different boiling points but comparable molecular masses. Ethanol has higher boiling point than propane because of H - bonding.
323056
Which among the following compounds has highest melting point?
1 tert-Butyl alcohol
2 n-Butyl alcohol
3 Isobutyl alcohol
4 sec-Butyl alcohol
Explanation:
tert - Butyl alcohol has a much higher melting point becuase of its symmetrical close packed structure than remaining.
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323057
Assertion : Methyl alcohol is more volatile than water. Reason : The oxygen containing angle is maximum in water than methanol.
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:
In the case of methanol \(\left(\mathrm{CH}_{3} \mathrm{OH}\right)\) and water \(\left(\mathrm{H}_{2} \mathrm{O}\right)\),the oxygen atom is \(\mathrm{sp}^{3}\) hybridized. The larger size of the \(\mathrm{CH}_{3}\) group in methanol compared to a single hydrogen atom results in greater steric hindrance. While there are lone pair-lone pair repulsions, these are outweighed by the steric hindrance from the larger \(\mathrm{CH}_{3}\) group. As a result, the angle between the oxygen atom and other atoms in methanol is greater compared to that in water. So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323058
Which of the following has lowest boiling point?
1 p-Nitrophenol
2 m-Nitrophenol
3 o-Nitrophenol
4 Phenol
Explanation:
o-Nitrophenol has intramolecular H- bonding. So, B.P. is low.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323059
Select the incorrect option from the following regarding the physical properties of alcohols and phenols.
1 The boiling points of alcohols and phenols are higher in comparison to hydrocarbons, ethers, haloalkanes and haloarenes of comparable molecular masses.
2 Ethanol and propane have comparable boiling points but differ only in the molecular masses.
3 The - OH group in alcohols and phenols is involved in the intermolecular hydrogen bonding.
4 The trend of boiling points is ethanol \(>\) methoxymethane > propane.
Explanation:
Ethanol and propane have different boiling points but comparable molecular masses. Ethanol has higher boiling point than propane because of H - bonding.
NEET Test Series from KOTA - 10 Papers In MS WORD
WhatsApp Here
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323056
Which among the following compounds has highest melting point?
1 tert-Butyl alcohol
2 n-Butyl alcohol
3 Isobutyl alcohol
4 sec-Butyl alcohol
Explanation:
tert - Butyl alcohol has a much higher melting point becuase of its symmetrical close packed structure than remaining.
MHTCET - 2021
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323057
Assertion : Methyl alcohol is more volatile than water. Reason : The oxygen containing angle is maximum in water than methanol.
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:
In the case of methanol \(\left(\mathrm{CH}_{3} \mathrm{OH}\right)\) and water \(\left(\mathrm{H}_{2} \mathrm{O}\right)\),the oxygen atom is \(\mathrm{sp}^{3}\) hybridized. The larger size of the \(\mathrm{CH}_{3}\) group in methanol compared to a single hydrogen atom results in greater steric hindrance. While there are lone pair-lone pair repulsions, these are outweighed by the steric hindrance from the larger \(\mathrm{CH}_{3}\) group. As a result, the angle between the oxygen atom and other atoms in methanol is greater compared to that in water. So the option (3) is correct.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323058
Which of the following has lowest boiling point?
1 p-Nitrophenol
2 m-Nitrophenol
3 o-Nitrophenol
4 Phenol
Explanation:
o-Nitrophenol has intramolecular H- bonding. So, B.P. is low.
CHXII11:ALCOHOLS, PHENOLS AND ETHERS
323059
Select the incorrect option from the following regarding the physical properties of alcohols and phenols.
1 The boiling points of alcohols and phenols are higher in comparison to hydrocarbons, ethers, haloalkanes and haloarenes of comparable molecular masses.
2 Ethanol and propane have comparable boiling points but differ only in the molecular masses.
3 The - OH group in alcohols and phenols is involved in the intermolecular hydrogen bonding.
4 The trend of boiling points is ethanol \(>\) methoxymethane > propane.
Explanation:
Ethanol and propane have different boiling points but comparable molecular masses. Ethanol has higher boiling point than propane because of H - bonding.
