Given below are two statements : Statement (I) : The boiling points of alcohols and phenols increase with increase in the number of C -atoms. Statement (II) : The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes. In the light of the above statements, choose the correct answer from the options given below :

Both Statement I and Statement II are true

Statement I is false but Statement II is true

Statement I is true but Statement II is false

Both Statement I and Statement II are false

Alcohols Phenols and Ethers PYQ — JEE Main 2025 · 23 Jan · Shift 2 · Q6 with Solution

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Correct answer: B

Analyze Statement (I):

Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
- In homologous series, as the number of carbon atoms increases, molecular mass increases.
- This increases van der Waals' forces between molecules.
- Hence, boiling point generally increases.
- This trend is valid for both alcohols and phenols.
Therefore, Statement (I) is true.
Analyze Statement (II):

Statement (II): The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes.
- Alcohols and phenols contain an $\mathrm{-OH}$ group.
- Due to this, they form intermolecular hydrogen bonding.
- Ethers and haloalkanes do not form such strong intermolecular hydrogen bonds.
- Therefore, alcohols and phenols have higher boiling points than ethers and haloalkanes of comparable molecular masses.
Therefore, Statement (II) is true.
Choose the correct option:

Since both Statement (I) and Statement (II) are true, the correct option is:

$\boxed{\text{B}}$
Comparison with stored correct answer:

Stored correct answer = B

Our derived answer = B

Hence, they agree.

View written solutionFree

Correct answer: B

Analyze Statement (I):

Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
- In homologous series, as the number of carbon atoms increases, molecular mass increases.
- This increases van der Waals' forces between molecules.
- Hence, boiling point generally increases.
- This trend is valid for both alcohols and phenols.
Therefore, Statement (I) is true.
Analyze Statement (II):

Statement (II): The boiling points of alcohols and phenols are higher in comparison to other class of compounds such as ethers, haloalkanes.
- Alcohols and phenols contain an $\mathrm{-OH}$ group.
- Due to this, they form intermolecular hydrogen bonding.
- Ethers and haloalkanes do not form such strong intermolecular hydrogen bonds.
- Therefore, alcohols and phenols have higher boiling points than ethers and haloalkanes of comparable molecular masses.
Therefore, Statement (II) is true.
Choose the correct option:

Since both Statement (I) and Statement (II) are true, the correct option is:

$\boxed{\text{B}}$
Comparison with stored correct answer:

Stored correct answer = B

Our derived answer = B

Hence, they agree.