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Question

Double bond equivalent (degree of Unsaturation) of (A) is:
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A
1
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B
2
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C
3
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D
4
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Solution

The correct option is B 3
degree of unsaturation = no of pi bonds+ no of rings
here,
no of rings= 2
and 1 mole of hydrogen gas is used by compound (A) for reduction of one pi bond
therefore, no of pi bonds in A=1
hence
DBE=3

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