Question

Find the degree of unsaturation for the following compounds A, B, C respectively:
A)

B)

C)

• A. $0,4,4$
• B. $0,4,3$
• C. $0,8,6$
• D. $0,4,0$

Answer 1

The correct option is B $0,4,3$

Degree of unsaturation (DOU/DU) is Sum of the number of π bonds and rings in a compound.
In compound A zero π bonds and zero rings so DU is zero.
In compound B four π bonds and zero rings so DU is four.
In compound B three π bonds and zero rings so DU is three.