Benzamide reacts with $Br_2$ and $KOH$ gives :-

An organic compound $[A]$ $(C_4H_{11}N)$ shows optical activity and gives $N_2$ gas on treatment with $HNO_2$. The compound $[A]$ reacts with $PhSO_2Cl$ producing a compound which is soluble in $KOH$. The structure of $A$ is:

Which of the following groups increases the basic strength of substituted aniline?

The correct increasing order of basic strength for the following compounds is:

Identify substrate $A$ in the following reaction.
$A + AgOH \xrightarrow[ii) \Delta]{i) \text{moist } Ag_2O} CH_3CH_2N(CH_3)_2 + CH_2=CH_2$

Which of the following is the most basic in an aqueous solution?