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

The suitable reagents $X$ and $Y$,respectively,in the following reactions are:

Would you expect $benzaldehyde$ to be more reactive or less reactive in nucleophilic addition reactions than $propanal$? Explain your answer.

What are the products formed when a mixture of benzaldehyde and formaldehyde is heated with an aqueous solution of $NaOH$?

Which one of the following will be most readily dehydrated in acidic condition?

Identify the reactant $X$ and the product $Y$ in the reaction of acetone with a Grignard reagent followed by hydrolysis.