A) \[C{{H}_{4}}\]
B) \[{{C}_{2}}{{H}_{4}}\]
C) \[{{C}_{2}}{{H}_{2}}\]
D) \[{{C}_{3}}{{H}_{6}}\]
Correct Answer: C
Solution :
All terminal alkynes behave as very weak acids. They react with \[NaN{{H}_{2}}\], Na, Tollens reagent, ammonia cal cuprous chloride solution. \[R-C\equiv CH+{{[Cu{{(N{{H}_{3}})}_{2}}]}^{+}}O{{H}^{-}}\] \[\underset{\begin{smallmatrix} Copper\,alkynide \\ (\operatorname{Re}d\,ppt.) \end{smallmatrix}}{\mathop{\xrightarrow{{}}R-C\equiv CCu\downarrow +{{H}_{2}}O+2N{{H}_{3}}}}\,\] This reaction show the acidic nature of alkynes.
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