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Chapter 2: Q4P (page 96)

Two isomers of 1,2 Dichloroethene are known. One has dipole moment of 2.4 D; the other has zero dipole moment. Draw the two isomers, and explain why one has zero dipole moment

CHCl=CHCl (1,2 Dichloroethene)

Short Answer

Expert verified

1,2 Dichloroethene has two isomers i.e. cis- and trans-1,2 Dichloroethene, both have different physical properties. Cis isomer has net dipole moment whereas dipole moment in trans isomer cancels and has zero dipole moment.


Cis-1,2-dichloroethene trans-1,2-dichloroethene

Step by step solution

01

Step-1

Cis isomer has dipole moment because two C-Cl bond are on same side therefore they strengthen each other as a result of which it is polar.

02

Step-2

Whereas trans isomer has two C-Cl bond moment opposite to each other, which cancels the dipole moment and net dipole moment is zero.

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