Explanation

(c)
In the carbonyl group, carbon atom is in a state of $sp^{2}$ hybridisation. One $sp^{2}$ hybrid orbital overlap with a unhydridised $p$-orbital of oxygen to form $C - O$ $\sigma$-bonds. The remaining two $sp^{2}$ orbitals of carbon from $\sigma$-bonds with $s$-orbitals of hydrogen or $sp^{3}$-orbitals of carbon of the alkyl groups. The $C - O$ $\pi$-bond is formed by the sideways overlap of $p$-orbitals of carbon and oxygen. Thus, the three $\sigma$-bonds of carbonyl carbon lie in one plane and are $120{^\circ}$ aprat
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