The major products A and B in the following reaction sequence are

Concept:-

The reaction proceeds through nucleophilic addition followed by epoxide formation and finally goes via the Wharton reaction.

Wharton reaction: In this reaction reduction of \(\alpha ,\beta\) - epoxy ketones by hydrazine in the presence of AcOH occurs which gives an allylic alcohol.

 For example,

Explanation:-

     The mechanism of the reaction is as follows;

• In the first step, the attack of hydroperoxyl nucleophile occurs followed by the epoxide formation and then the removal of the hydroxide ion to which compound A is formed.
• Then hydrazine which is added to the ketone forms a hydrazone derivative. It facilitates the ring opening of epoxide followed by the removal of N₂ the final product i.e. compound B we get is an allyl alcohol.

Conclusion:-

Hence, the major products A and B in the following reaction sequence are