AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure

The dominant intermolecular force that must be overcome to convert liquid methanol to its vapour is

A covalent bonds
B dipole-dipole interactions
C hydrogen bonds
D coordinate bonds

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Answer & Solution

Correct Answer

(C) hydrogen bonds

Step-by-step Solution

Detailed explanation

In methanol \(\left(\mathrm{CH}_3 \mathrm{OH}\right)\), intermolecular hydrogen bonding exists. When \(\mathrm{H}\)-atom is directly linked with nitrogen, oxygen or fluorine, it forms inter or intramolecular H-bond. Hence, the intermolecular \(\mathrm{H}\)-bonding in methanol…

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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$- OH$	$- CN$	$- {CO}_{2} H$	$- {OCH}_{3}$	$- {NHCOCH}_{3}$	$- CHO$
I	II	III	IV	V	VI