Question

The total number of acylic isomers including the stereoisomers (geometrical and optical), with the molecular formula $C_4{H}_{7}Cl$ is

• A. 12
• B. 11
• C. 10
• D. 9

Answer 1

Answer: (A)

Twelve in all [a] Six geometrical isomers (i)
(ii)
(iii)
(iv)
(v)
(vi)
[b] Two optical isomers (vii) $C{H}_3-\underset{\begin{array}{c}|\\ H\end{array}}{\stackrel{\begin{array}{c}Cl\\ |\end{array}}{{}^{\ast }C}}-CH=C{H}_2$ (viii) $C{H}_3-\underset{\begin{array}{c}|\\ Cl\end{array}}{\stackrel{\begin{array}{c}H\\ |\end{array}}{{}^{\ast }C}}-CH=C{H}_2$ [c] Four structural isomers (ix) $C{H}_{3}C{H}_2\stackrel{\begin{array}{c}Cl\\ |\end{array}}{C}=C{H}_2$ (x) $C{H}_3\stackrel{\begin{array}{c}C{H}_3\\ |\end{array}}{C}=CHCl$ (xi) $C{H}_3\stackrel{\begin{array}{c}C{H}_{2}Cl\\ |\end{array}}{C}=C{H}_2$ (xii) $ClC{H}_2-C{H}_2-CH=C{H}_2$