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JEE Main 2025 Jan 23 Shift 2, Chemistry Q7: Properties of Alcohol

JEE Main2025Jan 23, Shift 2Chemistry
Q.

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:

  1. A

    Both Statement I and Statement II are false

  2. B

    Statement I is false but Statement II is true

  3. C

    Statement I is true but Statement II is false

  4. D

    Both Statement I and Statement II are true

Solution

Statement I: Within the alcohol or phenol family, adding units raises the molecular mass and the dispersion-force contact area, which steadily raises the boiling point.

Statement II: Alcohols and phenols carry an group that engages in intermolecular hydrogen bonding. Ethers and haloalkanes of comparable molar mass lack this -bond donor, so their boiling points fall well below those of the corresponding alcohols and phenols.

Both statements are true.

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