Which of the following compounds is most reactive towards nucleophilic addition reaction?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Hint: Aldehyde is more reactive than ketone
The reactivity of aldehyde is more than ketone because in ketone carbonyl carbon is attached to two bulky groups which sterically hindered the attack of nucleophile. Thus, we can ruled out option second and fourth.
In ethanal and benzaldehyde, ethanal is more reactive towards nucleophilic addition reaction because the partially positive charge in carbonyl carbon of ethanal is more than benzaldehyde. Carbonyl carbon of benzaldehyde partially positive charge is more stable due to resonance effect of benzene ring. Hence option first is the correct answer.
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