alleryNucleophilic addition to carbonyl: nucleophile attacks:
AO
BC of C=O (electrophilic due to polarized C=O bond)
CH
DAnywhere
Answer & Solution
Correct answer: B. C of C=O (electrophilic due to polarized C=O bond)
C=O is polarized: C^(δ+) and O^(δ-).
Nucleophile (CN⁻, RMgX, H⁻ from NaBH₄) attacks electrophilic C. Tetrahedral intermediate formed
then protonated at O to give alcohol/cyanohydrin.
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