question_answer

With which of the following reagents carbonyl compound shows addition cun elimination reaction?

A) \[{{\operatorname{PCl}}_{5}}\]                        

B) Brady's reagent

C) HCN                            

D) All of these

Correct Answer: B

Solution :

Brady's reagent 2, 4-dinitrophenyl hydrazine - Brady's reagent In acidic medium, the oxygen of the carbonyl group gets protonated which in turn by resonance increases the +ve charge on carbonyl carbon. As a result weak nucleophiles like ammonia derivatives reading attack the carbonyl group.