A) \[{{H}_{3}}CC{{H}_{3}}\]
B) \[{{H}_{2}}C==C{{H}_{2}}\]
C) \[HC\equiv CH\]
D) \[{{H}_{3}}CC=C{{C}_{2}}{{H}_{5}}\]
E) \[{{H}_{5}}{{C}_{6}}C\equiv CC{{H}_{3}}\]
Correct Answer: C
Solution :
Alternate (c) i.e.,\[HC\equiv CH\]gives red precipitate with ammoniacal solution of cuprous chloride as follows \[HC\equiv CH+\underset{\begin{smallmatrix} ammonium \\ cuprous \\ chloride \end{smallmatrix}}{\mathop{C{{u}_{2}}C{{l}_{2}}}}\,+2N{{H}_{4}}OH\xrightarrow{{}}\] \[\underset{\begin{smallmatrix} copper\text{ }acetylide \\ (red\text{ }ppt.) \end{smallmatrix}}{\mathop{CuC\equiv CCu\downarrow }}\,+2N{{H}_{4}}Cl+2{{H}_{2}}O\]
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