Which of the following is the correct representation for intermediate of nucleophilic addition reaction to the given 
carbonyl compound (A)? 
Since, carbonyl compound is a planar molecule hence two orientation of molecule regarding attack of nucleophile is possible as follows
Since, the product contains a chiral carbon, therefore, attack of nucleophile can oocur either from front side attack or rear side attack giving enantiomeric products. Hence, (a) and (b) are the correct choices.
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