12. Which of these could be resolved into separate enantiomers? (A) 4-Methyl-1-pentanamine (B) 4-Methyl-2-pentanamine (C) $N$-Methyl-1-butanamine (D) $N,N$-Dimethyl-1-propanamine (E) $N$-Butyltrimethylammonium bromide

13. When 3-methyl-2-pentene is treated with mercuric acetate, $\mathrm{Hg(O_2CCH_3)_2}$, in a THF-$t$-butyl alcohol mixture and the resulting product is reacted with $\mathrm{NaBH_4}$ in basic solution, the principal product formed is which of these? (A) 3-methyl-3-pentanol (B) 3-$t$-butoxy-3-methylpentane (C) 3-methyl-2-pentanol (D) 2-$t$-butoxy-3-methylpentane (E) 1-$t$-butoxy-3-methylpentane

12. Which of these could be resolved into separate enantiomers?
(A) 4-Methyl-1-pentanamine
(B) 4-Methyl-2-pentanamine
(C) $N$-Methyl-1-butanamine
(D) $N,N$-Dimethyl-1-propanamine
(E) $N$-Butyltrimethylammonium bromide

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