Which of the following reagents can form a hydrazone with alkanone?

1. $\mathrm{NH}_3 \mathrm{OHCl}$
2. $\mathrm{PhNHNH}_2$
3. $\mathrm{NH}_2 \mathrm{NHCONH}_2$
4. $HCN$

Solution

Hydrazines react with alkanones to give an addition-elimination reaction and hydrazones are obtained.

Asked in: AP EAMCET 2004

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