The number of geometrical isomers of CH3 CH=CH-CH=CH-CH=CHCl are (a) 4 (b) 6 (c) 8 (d) 10

Name: Problem 30, Chapter 23: A Complete Resource Book in Chemistry for JEE Main
Uploaded: 2021-07-06T00:23:54-08:00
Duration: 1 min 53 s
Channel: Dr. Satish Ingale
Description: The number of geometrical isomers of CH3 CH=CH-CH=CH-CH=CHCl are (a) 4 (b) 6 (c) 8 (d) 10

step 1 Hi everyone so in this question they asked the number of geometrical isomers of CS3 CHWBH CH WBH

The number of geometrical isomers of CH3 CH=CH-CH=CH-CH=CHCl...

Key Concepts

Geometric Isomerism

This concept refers to the phenomenon where molecules with the same connectivity differ in the spatial arrangement of groups around a rigid structure, typically a double bond. The lack of rotation about the double bond leads to distinct isomers (commonly described as cis and trans, or E and Z) that have different physical and chemical properties.

Double Bond Stereochemistry

Double bonds in organic molecules enforce planarity at the bonded carbons, preventing rotation and allowing substituents to adopt specific spatial arrangements. The orientation of groups attached to the double bond carbons is essential in determining whether an isomer is classified as cis (same side) or trans (opposite sides), which is a key factor in understanding the diversity of isomeric forms in unsaturated compounds.

Substituent Effects on Isomerism

The nature and positioning of substituent groups around a double bond are crucial in enabling geometric isomerism. For a double bond to exhibit cis-trans isomerism, each carbon must have two different substituents. The identity and steric requirements of these substituents can influence the stability and the number of possible isomers.

Configurational Analysis

Counting the possible stereoisomers in molecules with multiple double bonds involves analyzing each stereogenic double bond independently while considering the molecule's overall symmetry. This process entails determining each double bond’s possible configurations and how they combine, often using combinatorial methods, while being mindful of any identical or redundant structures due to symmetry.

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