In the reaction $C_6H_5CHO + C_6H_5NH_2 \to C_6H_5N=CHC_6H_5 + H_2O$,the compound $C_6H_5N=CHC_6H_5$ is known as

The correct order of basicity for the following molecules is $:$

$CH_3COOH$ $\xrightarrow[\Delta ]{NH_3} X$ $\xrightarrow{NaOBr} Y$ $\xrightarrow{NaNO_2 + HCl} Z$. What is $Z$?

Which of the following is the weakest base?

What is the correct order of basicity for the given amines in a chlorobenzene medium?
$(A)$ $CH_3CH_2NH_2$
$(B)$ Cyclohexylamine
$(C)$ $N$-Methylpiperidine
$(D)$ Pyrrolidine

$CH_3-CH_2-CH(CH_3)-CONH_2$ $\xrightarrow[ \Delta ]{ Br_2/KOH } (A)$ $\xrightarrow[ (2) AgOH/\Delta ]{ (1) CH_3I (excess) } (B)$. The major product $(B)$ is: