Question

The carbonyl C-atom is ...I... hybridised and forms ...II... ' $\sigma$ '-bonds. Fourth valence electron of carbon remains in its $p$-orbital and forms a ...III... bond with oxygen by overlap with $p$-orbital of an oxygen.
Identify I, II, III from the given options in order to complete the statement.

• A. $ I- s p^{3} , II - 2 \sigma , III -\pi$
• B. $ I-s p^{3} , II - 3 \sigma, III - \sigma$
• C. $ I-s p^{2} , II - 2 \sigma , III - \sigma$
• D. $ I-s p^{2} , II - 3 \sigma, III - \pi$

Answer 1

Answer: (D)

The carbonyl C-atom is $s p^{2}$-hybridised and forms three sigma ( $\sigma$ ) bonds. The fourth valence electron of carbon remains in its $p$-orbital and forms a $\pi$-bond with oxygen by overlap with $p$-orbital of an oxygen.