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NEET levelSingle correct optionDifficulty 1 of 3o1175

During hydrolysis of an ester by hydroxide, the hybridisation of the carbonyl carbon changes as

A $s p^{2}$ throughout
B $s p^{2} \to s p^{3} \to s p^{2}$
C $s p^{2} \to s p \to s p^{2}$
D $s p^{3} \to s p^{2} \to s p^{3}$

Answer: B

The trigonal carbonyl carbon (

s p^{2}

) is attacked by

OH X^{-}

to give a tetrahedral intermediate (

s p^{3}

), which expels the alkoxide and regenerates a trigonal carbonyl carbon (

s p^{2}

).

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