Some Basic Principles Of Organic Chemistry Question 357
Question: Which of the following compounds will exhibit cis-trans isomerism [Kerala PMT 2004]
Options:
A) 2-butene
B) 2-butyne
C) 2-butanol
D) Butanone
E) Butanol
Show Answer
Answer:
Correct Answer: A
Solution:
$ \underset{\text{cis 2 butene}}{\mathop{\begin{matrix} CH_3 \\ \ \ H \\ \end{matrix}>C=C<\begin{matrix} CH_3 \\ H\ \ \ \\ \end{matrix}}}, $
$ \underset{\text{Trans 2 butene}}{\mathop{\begin{matrix} CH_3 \\ \ \ H \\ \end{matrix}>C=C<\begin{matrix} H\ \ , \\ CH_3 \\ \end{matrix}}}, $ Cis-trans isomerism shown by compound which have double or triple bond by which they restrict their rotation, since 2 butyne have no hydrogen on triple bonded carbon.
$ CH_3-C\equiv \underset{\text{2 butyne}}{\mathop{C-CH_3}}, $ [It does not show cis-trans]
