Isomeric amines with molecular formula C_8H_{ | vedclass

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(A) Step $1$: Isomer $(P)$ is prepared by Gabriel phthalimide synthesis, which is specific for aliphatic primary amines. Among the choices, $2$-phenyl

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(A) Step $1$: Isomer $(P)$ is prepared by Gabriel phthalimide synthesis, which is specific for aliphatic primary amines. Among the choices, $2$-phenylethanamine $(C_6H_5CH_2CH_2NH_2)$ is an aliphatic primary amine.Step $2$: Isomer $(Q)$ reacts with Hinsberg's reagent (benzenesulfonyl chloride) to form a sulfonamide insoluble in $NaOH$. This indicates a secondary amine $(2^{\circ})$, as the resulting sulfonamide lacks an acidic hydrogen on the nitrogen. $N$-ethylaniline $(C_6H_5NHC_2H_5)$ is a secondary amine.Step $3$: Isomer $(R)$ reacts with $HONO$ at $273-278 \ K$ to form a diazonium salt, which couples with $\beta$-naphthol to give a red azo dye. This is characteristic of aromatic primary amines. $o$-ethylaniline is an aromatic primary amine.Step $4$: Comparing these requirements with the provided structures, the correct sequence $(P, Q, R)$ is found in option $A$.

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