Among the situations given, the situation in which cis‑trans isomerism will occur has to be chosen from the given options. Concept Introduction: Alkenes are hydrocarbons that contain at least one double bond in it. There will not be any free rotation of the double bond in alkene. Hence, cis‑trans isomerism is possible. The first and foremost condition for the alkene to exhibit cis‑trans isomerism is that the carbon attached in either end of double bond must have different groups attached to it. A cis isomer is the one in which the same groups are present on same side of both the carbon atoms present in the double bond. A trans isomer is the one in which the same groups are present on opposite side of both the carbon atoms present in the double bond. Cis‑trans isomerism is not possible if any one of the carbon atom bonded to the double bond bears two identical groups. Cis‑trans isomers are not constitutional isomers but they are stereoisomers.

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Chapter 13.6, Problem 1QQ

Interpretation Introduction

Interpretation:

Among the situations given, the situation in which cis‑trans isomerism will occur has to be chosen from the given options.

Concept Introduction:

Alkenes are hydrocarbons that contain at least one double bond in it. There will not be any free rotation of the double bond in alkene. Hence, cis‑trans isomerism is possible. The first and foremost condition for the alkene to exhibit cis‑trans isomerism is that the carbon attached in either end of double bond must have different groups attached to it.

A cis isomer is the one in which the same groups are present on same side of both the carbon atoms present in the double bond.

A trans isomer is the one in which the same groups are present on opposite side of both the carbon atoms present in the double bond.

Cis‑trans isomerism is not possible if any one of the carbon atom bonded to the double bond bears two identical groups.

Cis‑trans isomers are not constitutional isomers but they are stereoisomers.

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