Question

Choose the correct statement(s) for the following compounds :

• A. The degree of unsaturation for (a) is 9
• B. The degree of unsaturation for (a) is 10
• C. The degree of unsaturation for (b) is 8
• D. The degree of unsaturation for (b) is 10

Answer 1

Answer: (B), (D)

The correct options are
B The degree of unsaturation for (a) is 10
D The degree of unsaturation for (b) is 10

The given compounds are :

Degree of unsaturation (DOU) = Number of $\pi$ bonds + Number of rings
For (a) :
Number of rings : 3
Number of $\pi$ bonds : 7
$DOU=3+7=10$
For (b) :
Number of rings : 3
Number of $\pi$ bonds : 7
$DOU=3+7=10$
Hence (b) and (d) are correct options.