A) \[{{C}_{2}}{{H}_{6}}\]
B) \[{{C}_{2}}{{H}_{4}}\]
C) \[{{C}_{2}}{{H}_{2}}\]
D) \[C{{H}_{4}}\]
Correct Answer: B
Solution :
Unsaturated compounds like ethylene and acetylene decolourise \[\text{B}{{\text{r}}_{\text{2}}}\]water. Acetylene gives precipitate with ammoniacal \[\text{AgN}{{\text{O}}_{\text{3}}}\]but with ammoniacal \[\text{AgN}{{\text{O}}_{\text{3}}}\]ethylene do not give any reaction. \[\underset{CH}{\overset{CH}{\mathop{|\,|\,|}}}\,\xrightarrow{Ag{{(N{{H}_{3}})}_{2}}N{{O}_{3}}}\underset{C.Ag}{\overset{CH}{\mathop{|\,|\,|}}}\,\xrightarrow{Ag{{(N{{H}_{3}})}_{2}}N{{O}_{3}}}\underset{\begin{smallmatrix} \text{(white}\,\text{ppt)} \\ \text{Disilver}\,\text{acetylide} \end{smallmatrix}}{\mathop{\underset{C.Ag}{\overset{C.Ag}{\mathop{|\,|\,|}}}\,}}\,\]\[{{C}_{2}}{{H}_{4}}\xrightarrow{Ag{{(N{{H}_{3}})}_{2}}N{{O}_{3}}}\]No reaction
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