• question_answer Number of isomers of molecular formula ${{C}_{2}}{{H}_{2}}B{{r}_{2}}$ are [CPMT 1987] A) 1 B) 2 C) 3 D) 0

${{C}_{2}}{{H}_{2}}B{{r}_{2}}$ Has three isomers. (1) $\underset{1,\,2\text{-dibromoethene}}{\mathop{\underset{(cis)}{\mathop{\underset{{}}{\mathop{H-\underset{Br}{\mathop{\underset{|\,\,\,}{\mathop{C\,}}\,}}\,=\underset{Br}{\mathop{\underset{|\,\,\,}{\mathop{C\,}}\,}}\,-H}}\,}}\,}}\,$ (2) $\underset{\text{1, 2-dibromoethene}}{\mathop{\underset{\text{(Trans)}}{\mathop{\underset{{}}{\mathop{\underset{Br\,\,\,}{\mathop{\underset{|\,\,\,\,}{\mathop{CH}}\,}}\,=\overset{Br}{\mathop{\overset{|\,\,\,\,}{\mathop{CH}}\,}}\,}}\,}}\,}}\,$ (3) $\underset{\text{1,1-dibromoeth}\,\text{ene}}{\mathop{C{{H}_{2}}=C<_{Br}^{Br}}}\,$