JEE Main 20241 FebruaryEvening Shift

Exam: JEE Main
Year: 2024
Date: 1 February
Shift: Evening Shift
Subject: Chemistry
Chapter: General Organic Chemistry

JEE Main 2024 · 1 February · Evening Shift · Chemistry · General Organic Chemistry

Which among the following has highest boiling point?

Options

A ${CH}_{3}{CH}_{2}{CH}_{2}{CH}_{3}$
B ${CH}_{3}{CH}_{2}{CH}_{2}{CH}_{2} - OH$
C ${CH}_{3}{CH}_{2}{CH}_{2}CHO$
D ${H}_{5}{C}_{2} - O - {C}_{2}{H}_{5}$

Correct answer

B. ${CH}_{3}{CH}_{2}{CH}_{2}{CH}_{2} - OH$

Step-by-step solution

The boiling points of aldehydes and ketones are higher than hydrocarbons and ethers of comparable molecular masses. It is due to weak molecular association in aldehydes and ketones arising out of the dipole-dipole interactions. Also, their boiling points are lower than those of alcohols of similar molecular masses due to absence of intermolecular hydrogen bonding.

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