Which among the following compound does not exhibit cis-trans isomerism?

Which among the following compound does not exhibit cis-trans isomerism?
  1. $\mathrm{H}_2 \mathrm{C}=\mathrm{C}(\mathrm{R})_2$
  2. $\mathrm{R}_1 \mathrm{R}_2 \mathrm{C}=\mathrm{CR}_1 \mathrm{R}_2$
  3. $\mathrm{R}-\mathrm{CH}=\mathrm{CHR}$
  4. $\mathrm{R}_1 \mathrm{CH}=\mathrm{CR}_1 \mathrm{R}_2$

Solution

For cis-trains isomerism, each terminal of double bond must have different group. In this, terminal have same groups So, cis-trans isomerism is not possible.

Asked in: MHT CET 2022 (11 Aug Shift 1)

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