\[ \mathrm{MeCH}_{2} \mathrm{C} \equiv \mathrm{CH} \xrightarrow{\mathrm{NH}_{3} / \mathrm{NaNH}_....
0\[
\mathrm{MeCH}_{2} \mathrm{C} \equiv \mathrm{CH} \xrightarrow{\mathrm{NH}_{3} / \mathrm{NaNH}_{2}} \mathrm{~A} \xrightarrow{\mathrm{EtBr}} \mathrm{B} \text {, }
\]
P
\( A \) and \( B \) are
W
(1) \( \mathrm{MeCH}_{2} \mathrm{C} \equiv \mathrm{CNa}, \mathrm{MeCH}_{2} \mathrm{C} \equiv \mathrm{C}-\mathrm{Et} \)
(2) \( \mathrm{MeCH}_{2} \mathrm{CH}=\mathrm{CH}_{2}, \mathrm{MeCH}_{2}-\mathrm{CHEt}-\mathrm{CH}_{3} \)
(3)
\[
\begin{array}{l}
\mathrm{MeCH}_{2} \mathrm{CH} \equiv \mathrm{CHNH}_{2}, \\
\mathrm{MeCH}_{2} \mathrm{CH}=\mathrm{CH}-\mathrm{NHBr}
\end{array}
\]
(4) \( \mathrm{MeCH}_{2} \equiv \mathrm{C}-\mathrm{NH}_{2}, \mathrm{MeC} \equiv \mathrm{C}-\mathrm{NH}-\mathrm{Br} \)
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