alleryThe carbonyl carbon in aldehydes and ketones is:
Asp-hybridised, linear
Bsp²-hybridised, planar (with ~120° bond angles); C=O is polar — Cδ+, Oδ−
Csp³d-hybridised, trigonal bipyramidal
Dsp³-hybridised, tetrahedral
Answer & Solution
Correct answer: B. sp²-hybridised, planar (with ~120° bond angles); C=O is polar — Cδ+, Oδ−
**Carbonyl C is sp²-hybridised**: three σ-bonds in a plane (~120°) + one π-bond with oxygen.
The **C=O bond is polar** (O is much more electronegative): Cδ+ (electrophilic) and Oδ− (nucleophilic).
This polarity drives most of the chemistry of aldehydes/ketones.
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