A) \[{{C}_{2}}{{H}_{2}}\] and \[C{{H}_{4}}\]
B) \[{{C}_{2}}{{H}_{2}}\]and \[{{C}_{2}}{{H}_{4}}\]
C) \[{{C}_{2}}{{H}_{4}}\] and \[C{{H}_{4}}\]
D) \[{{C}_{2}}{{H}_{2}}\]
Correct Answer: B
Solution :
Copper and silver alkylides are obtained by passing alkynes in the ammoniacal solution of cuprous chloride and silver nitrate respectively. These-reactions are used for detecting the presence of acetylenic hydrogen atom. \[\underset{acetylene}{\mathop{HC\equiv CH}}\,+\underbrace{C{{u}_{2}}C{{l}_{2}}+2N{{H}_{4}}OH}_{\begin{smallmatrix} ammoniacal \\ cuprous\text{ }chloride \end{smallmatrix}}\] \[\underset{\begin{smallmatrix} copper\text{ }acetylide \\ (redppt) \end{smallmatrix}}{\mathop{Cu\,\,.\,\,C\equiv C\,\,.\,\,Cu\,\downarrow }}\,\,\,\,+2N{{H}_{4}}Cl+2{{H}_{2}}O\] So, alkanes and alkenes remain unaffected.
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