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(B) When the given mixture is shaken with $1 \, M \, HCl$,the amine gets protonated to form a salt,which is a cation $\left( RNH_2CH_3^{\oplus} \right

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$(II)$

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(B) When the given mixture is shaken with $1 \, M \, HCl$,the amine gets protonated to form a salt,which is a cation $\left( RNH_2CH_3^{\oplus} \right)$.This salt is ionic and therefore dissolves in the aqueous layer $(H_2O)$ rather than the organic solvent.Among the given compounds,$(II)$ is an amine ($N$-methylcyclohexylamine),which reacts with $HCl$ to form a water-soluble salt.The other compounds (sulfide,ether,and ketone) do not react with $1 \, M \, HCl$ to form ionic species and remain in the organic layer.Therefore,the correct option is $(II)$.

$A$ mixture containing the following four compounds is extracted with $1 \, M \, HCl$. The compound that goes to the aqueous layer is:
$(I)$ Cyclohexyl methyl sulfide
$(II)$ $N$-methylcyclohexylamine
$(III)$ Methoxycyclohexane
$(IV)$ Cyclohexyl methyl ketone

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$A$ mixture containing the following four compounds is extracted with $1 \, M \, HCl$. The compound that goes to the aqueous layer is:$(I)$ Cyclohexyl methyl sulfide$(II)$ $N$-methylcyclohexylamine$(III)$ Methoxycyclohexane$(IV)$ Cyclohexyl methyl ketone