Base-catalyzed aldol condensation occurs with:

In the following reactions,products $A$ and $B$ are

What are $X$,$Y$,and $Z$ in the following reaction sequence respectively?
Benzene $\xrightarrow{X}$ Benzaldehyde $\xrightarrow{\text{Conc. NaOH}, \Delta} Y + Z$

An organic compound $(X)$ has an empirical formula $C_4H_8O$. This gives a pale yellow precipitate with iodine in $NaOH$ solution. What is $X$?

$C_6H_5CHO + HCN \to C_6H_5-CH(OH)-CN$. The product would be

$HCHO$ was treated with a reagent $X$. The product formed upon hydrolysis in the presence of an acid gave $C_{2}H_{5}OH$. The reagent $X$ is