Easy MCQ +4 / -1 PYQ · JEE Mains 2025

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 Statement I is false but Statement II is true
  2. B Both Statement I and Statement II are true Correct answer
  3. C Statement I is true but Statement II is false
  4. D Both Statement I and Statement II are false

Solution

<p>$\textbf{Statement (I):}$ </p> <p><p>As the number of carbon atoms in alcohols or phenols increases, the molecule becomes larger, which in turn enhances the van der Waals (dispersion) forces between the molecules.</p></p> <p><p>Stronger intermolecular forces require more energy (i.e., higher temperature) to overcome, leading to higher boiling points.</p></p> <p><p>Therefore, Statement (I) is true.</p></p> <p>$\textbf{Statement (II):}$ </p> <p><p>Alcohols and phenols have a hydroxyl group ($-OH$) that can form hydrogen bonds, which are significantly stronger than the dipole-dipole interactions typically seen in ethers or the interactions in haloalkanes.</p></p> <p><p>This stronger hydrogen bonding means that alcohols and phenols have higher boiling points compared to ethers and haloalkanes of similar molecular weight.</p></p> <p><p>Hence, Statement (II) is also true.</p></p> <p>Based on the above points, the correct answer is:</p> <p>Option B: Both Statement I and Statement II are true.</p>

About this question

Subject: Chemistry · Chapter: Alcohols, Phenols and Ethers · Topic: Preparation and Properties of Alcohols

This question is part of PrepWiser's free JEE Main question bank. 37 more solved questions on Alcohols, Phenols and Ethers are available — start with the harder ones if your accuracy is >70%.

Drill 25 more like these. Every day. Free.

PrepWiser turns these solved questions into a daily practice loop. Chapter-wise drills, full mocks, AI doubt chat. No auto-renew.

Start free →