What is formed when benzaldehyde reacts with chlorine in the absence of a catalyst?

Compound $(A)$,$C_6H_{12}O_3$,when treated with $I_2$ in aqueous sodium hydroxide gives a yellow precipitate. When $(A)$ is treated with Tollens' reagent,no reaction occurs. When $(A)$ is hydrolysed and then treated with Tollens' reagent,a silver mirror is formed in the test tube. Compound $(A)$ will be

Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam $(Zn(Hg))$ and concentrated $HCl$ is called:

Which of the following on reaction with Grignard reagent followed by hydrolysis forms a tertiary alcohol?

Trichloroacetaldehyde was subjected to Cannizzaro's reaction by using $NaOH$. The mixture of the products contains sodium trichloroacetate and another compound. The other compound is:

$4$-formylbenzoic acid on treatment with one equivalent of hydrazine followed by heating with alc. $KOH$ gives the major product: