Question

Aldehyde and ketone undergo nucleophilic addition reaction because of polarity between `gtC=O` group . The reactivity of carbonyl groups toward nucleophile depends upon the nature of inductive effect of froup present at carbonyl carbon.
Which of the following is least reactive for nucleophilic addition reaction
A. `C_(6)H_(5)-overset(O)overset(||)(C)-C_(6)H_(5)`
B. `C_(6)H_(5)-overset(O)overset(||)(C)-CH_(3)`
C. `C_(6)H_(5)-overset(O)overset(||)(C)-H`
D. `CH_(3)-overset(O)overset(||)(C)-H`

Answer 1

Correct Answer - A
`A=F CH_(2)CHO,` electron withdrawing group increases group increases electrophilicity of carbon increasing reate of nucleophilic addition reaction while conjugation or electron donating group decreases electrophilicity.
`C_(6)H_(5)-overset(O)overset(||)(C)-C_(6)H_(5)`