ChemistryNEET 2019Electronic effects: inductive, resonance, hyperconjugation

Organic Chemistry: Some Basic Principles and Techniques

The compound that is most difficult to protonate (at the carbonyl oxygen) among the following is:

A.Formaldehyde, $HCHO$
B.Acetaldehyde, $C H_{3} CHO$
C.Acetone, $C H_{3} COC H_{3}$
D.Benzaldehyde, $C_{6} H_{5} CHO$ ✓

You have the answer. The worked solution — and why the other three were written — is part of a paid pack.

More from this chapter in past papers

A tertiary-butyl carbocation is more stable than a secondary-butyl carbocation because of:NEET 2020

From Chemistry › Organic Chemistry: Some Basic Principles and Techniques › Electronic effects: inductive, resonance, hyperconjugation — lectures, notes and every past question on it.

Last revised 7 Sept 2026. Found a mistake? Tell us — corrections are the fastest thing we act on.

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