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Question

Find the degree of unsaturation for the following compounds A, B, C and D respectively :
A.
B.
C. D.

A
2,4,4,2
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B
1,3,3,2
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C
4,2,2,4
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D
2,4,4,3
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Solution

The correct option is A 2,4,4,2
Degree of unsaturation (DOU/DU) is Sum of the number of π bonds and rings in a compound.
In compound A one π bonds and one rings so DU is two.
In compound B three π bonds and one rings so DU is four.
In compound C three π bonds and one rings so DU is four.
In compound D two π bonds and zero rings so DU is two.

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