The reaction of benzaldehyde with HCN is an example of:
Correct answer: B. Nucleophilic addition
- A. Electrophilic substitution
- B. Nucleophilic addition
- C. Electrophilic addition
- D. Nucleophilic substitution
Explanation
This is a classic nucleophilic addition reaction. The nucleophilic cyanide ion (CN⁻) attacks the partially positive (electrophilic) carbon atom of the carbonyl group, and the oxygen atom is subsequently protonated.
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About Aldehydes and Ketones
Aldehydes and ketones contain the polar carbonyl group, but aldehydes are generally more readily oxidised and more reactive than ketones. Coverage includes preparation by oxidation or reduction routes, nucleophilic addition of reagents such as hydrogen cyanide and bisulfite, and tests that distinguish aldehydes from ketones.
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