Question

Cis 1-2 Dichloroethylene is IR active
with
respect to
C=C stretching
Whereas trans 1-2 Dichloroethylene
is not, explain​

Answer 1

Dipole moment os cis form is more than trans form(almost zero) hence,absorve IR and become IR active

Answer 2

Cis 1-2 Dichloroethylene is IR active with respect to C=C stretching.

As per the given question, Cis 1-2 Dichloroethylene is IR active with respect to C=C stretching. Whereas trans 1-2 Dichloroethylene is not.

For most of the normal vibrations, dipole moment change occurs for cis - isomers, trans - isomers. However, are highly symmetrical and consequently remain forbidden. The structure of trans isomer is more symmetrical as compared to the cis – isomer. In the trans – isomer the dipole moments of the polar C-Cl bonds are likely to cancel effect of each other and the resultant dipole moment of the molecule is nearly zero. But in the cis – isomer these do not cancel. Therefore the cis isomer has a specific moment but is zero in case of trans isomer.

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