MHT CET · Chemistry · Carboxylic Acid Derivatives

Select the CORRECT increasing order of boiling points of alcohols, amines and carboxylic acids of comparable molar mass from the following.

A Alcohols \( < \) Amines \( < \) Carboxylic acids
B Amines \( < \) Carboxylic acids \( < \) Alcohols
C Amines \( < \) Alcohols \( < \) Carboxylic acids
D Carboxylic acids \( < \) Alcohols \( < \) Amines

Verified Solution

Answer & Solution

Correct Answer

(C) Amines \( < \) Alcohols \( < \) Carboxylic acids

Step-by-step Solution

Detailed explanation

\(\mathrm{N}-\mathrm{H}\) bonds in amines are less polar than \(\mathrm{O}-\mathrm{H}\) bond in alcohols. Carboxyl group \((-\mathrm{COOH})\) of carboxylic acid contains \(\mathrm{O}-\mathrm{H}\) bond which is responsible for formation of hydrogen bonding. Strength of hydrogen bonding in carboxylic acid is greater than that of alcohols.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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