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Alcohols Phenols and Ethers question

2023 · 8 Apr · Shift 1 · Q1
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Alcohols Phenols and Ethers question

2023 · 8 Apr · Shift 1 · Q1

JEE MainChemistryAlcohols Phenols and EthersMCQ+4 / −1
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Butan -1- ol has higher boiling point than ethoxyethane. Reason R: Extensive hydrogen bonding leads to stronger association of molecules. In the light of the above statements, choose the correct answer from the options given below:
  1. A
    A is false but R is true
  2. B
    Both A and R are true but R is not the correct explanation of A
  3. C
    Both A and R are true and R is the correct explanation of A
  4. D
    A is true but R is false
View written solutionFree

Correct answer: C

  1. Identify the compounds

    • Butan-1-ol: CH3CH2CH2CH2OH\mathrm{CH_3CH_2CH_2CH_2OH}CH3​CH2​CH2​CH2​OH, an alcohol.
    • Ethoxyethane: C2H5OC2H5\mathrm{C_2H_5OC_2H_5}C2​H5​OC2​H5​, an ether.

  2. Compare intermolecular forces

    • In butan-1-ol, the presence of the −OH-OH−OH group allows intermolecular hydrogen bonding between molecules.
    • In ethoxyethane, there is an oxygen atom, so it has dipole-dipole interactions, but it cannot form intermolecular hydrogen bonding among its own molecules because it has no O−HO-HO−H bond.

  3. Effect on boiling point

    • Stronger intermolecular forces lead to a higher boiling point.
    • Since butan-1-ol shows extensive hydrogen bonding, its molecules are more strongly associated than those of ethoxyethane.
    • Therefore, butan-1-ol has a higher boiling point than ethoxyethane.

    So, Assertion A is true.

  4. Check the Reason

    • Reason states: Extensive hydrogen bonding leads to stronger association of molecules.
    • This statement is correct.

    So, Reason R is also true.

  5. Check whether R explains A

    • The higher boiling point of butan-1-ol is exactly because of the stronger intermolecular association caused by hydrogen bonding.
    • Hence, R is the correct explanation of A.

  6. Correct option C: Both A and R are true and R is the correct explanation of A\boxed{\text{C: Both A and R are true and R is the correct explanation of A}}C: Both A and R are true and R is the correct explanation of A​

  7. Comparison with stored answer

    • Derived answer: C\boxed{\text{C}}C​
    • Stored correct answer: C\boxed{\text{C}}C​
    • They match.
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