Which of the following statements is correct?

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(A) Primary,secondary,and tertiary amines with the same molecular formula are functional isomers. $CH_3-CH_2-CH_2-NH_2$ (a $1^\circ$ amine) and $CH_3-

Vedclass · Accepted Answer

$CH_3-CH_2-CH_2-NH_2$ and $CH_3-CH_2-NH-CH_3$ are functional isomers.

Vedclass · Answer

(A) Primary,secondary,and tertiary amines with the same molecular formula are functional isomers. $CH_3-CH_2-CH_2-NH_2$ (a $1^\circ$ amine) and $CH_3-CH_2-NH-CH_3$ (a $2^\circ$ amine) both have the molecular formula $C_3H_9N$,thus they are functional isomers.$(b)$ Homologues differ by a $-CH_2-$ group. These are not homologues.$(c)$ In the gaseous phase,basicity increases with the number of alkyl groups due to the $+I$ effect: $CH_3-N(CH_3)-CH_3 > CH_3-NH-CH_3 > CH_3-NH_2$.$(d)$ Boiling point depends on hydrogen bonding. $CH_3-NH_2$ has two $H$-atoms on $N$,$CH_3-NH-CH_3$ has one,and $CH_3-N(CH_3)-CH_3$ has none. Thus,the order is $CH_3-NH_2 > CH_3-NH-CH_3 > CH_3-N(CH_3)-CH_3$.

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