The reaction of hydrazine $(NH_2NH_2)$ with aldehydes and ketones yields a compound with the general structure:

Identify $X$ and $Y$ in the following reaction:

$C_7H_6O$ is the molecular formula of $X$,which gives a negative Fehling test but a positive Tollen's test. $X$ $\xrightarrow[AcONa]{Ac_2O} Y$ $\xrightarrow[Me_2NH]{1. SOCl_2} Z$. The correct option is:

Which of the following carbonyl compounds forms the most stable hydrate when $H_2O$ is added across the $C=O$ group?

Two moles of benzaldehyde and one mole of acetone under alkaline conditions using aqueous $NaOH$ after heating gives $x$ as the major product. The number of $\pi$ bonds in the product $x$ is.................

Reduction of an aldehyde produces