Which of the following compounds will exhibit cis-trans (geometrical) isomerism?

Which of the following compounds will exhibit cis-trans (geometrical) isomerism?
  1. 2-butene
  2. Butanol
  3. 2-butyne
  4. 2-butenol

Solution

Key Idea Compounds which have at least one double bond $(\mathrm{C}=\mathrm{C})$ and the groups attached with double bonded carbon atoms are different, exhibit geometrical isomerism. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{OH} \Rightarrow$ no geometrical isomers butanol $\mathrm{CH}_3 \mathrm{C} \equiv \mathrm{CCH}_3 \Rightarrow$ no geometrical isomers $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C}(\mathrm{OH})=\mathrm{CH}_2$ $\Rightarrow$ no geometrical isomers.

Asked in: NEET 2009 (Screening)

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