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: C
Solution :
Copper and silver alkynides 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. \[\underset{acetylene}{\mathop{HC\equiv CH}}\,+\underbrace{C{{u}_{2}}C{{l}_{2}}+2N{{H}_{4}}OH}_{\begin{smallmatrix} ammoniacal \\ cuprous\,\,chloride \end{smallmatrix}}\xrightarrow{{}}\] \[\underset{\begin{smallmatrix} copper\,\,acetylide \\ \,\,\,\,\,\,\,\,\,\,(red\,ppt.) \end{smallmatrix}}{\mathop{Cu\cdot C\equiv C\cdot Cu}}\,\downarrow +2N{{H}_{4}}Cl+2{{H}_{2}}O\] So, alkanes and alkenes remain unaffected.
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