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Question
Which of the following is the correct representation for intermediate of nucleophilic addition reaction to the given carbonyl compound (A):
(i) 
(ii) 
(iii) 
(iv) 
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Solution
(i)
(ii)
Explanation:
The given compound is a planar molecule with sp2 hybridized carbon. Carbon atoms are attacked by nucleophiles. If the nucleophile approaches from the front, the (i) and (ii) molecules shift to the front and back positions, respectively and the carbon becomes tetrahedral. Another alternative is that (i) and (ii) molecules will be located above and below the plane, respectively. As a result, the choices (iii) and (iv) aren't represented as planar molecules.
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