Question

8. Explain the following observation of C=C stretching frequency.
CH2
=CH2
VE 1678 cm-1 1
V=1780cm-1​

Answer 1

Answer:

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Explanation:

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Answer 2

The stretching frequency of C=C is

1. Symmetric stretch

2.  Asymmetric stretch

Explanation:

For considering IR waves,

v cm⁻¹

Triple bond          2100cm⁻¹          Alkyne

Double bond  1650cm⁻¹     Alkene

Single bond          1130cm⁻¹         Alkane

According to these IR waves, C=C stretching observation regarding 1678cm⁻¹ is olefins.

Example:

IR-9  1- heptene, thin film

H₂C=CH-CH₂-CH₂CH₂CH₂CH₃.

IR-40  2,5 Dimethooxy 2,5- dihydrofuran, neat liquid