Urotropine is

The major product $'P'$ formed in this reaction is:

Acetaldehyde forms a white crystalline precipitate on mixing with a ...... solution of

An organic compound with the molecular formula $C_9H_{10}O$ forms a $2,4-DNP$ derivative,reduces Tollen's reagent and undergoes Cannizzaro reaction; on vigorous oxidation it gives $1,2-$benzenedicarboxylic acid. The structure of the organic compound is:

The product of reduction of benzaldehyde is

$A$ and $B$ are isomers; Isomer $B$ is