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What is the degree of unsaturation (rings plus pi bonds) of the compound shown?

A $3$
B $4$
C $5$
D $6$

Answer: C

The compound shown is benzaldehyde,

C X_{7} H X_{6} O

. It has one ring, three C=C bonds in the ring and one C=O bond, so rings plus pi bonds

= 1 + 3 + 1 = 5

. Formula check:

(2 \times 7 + 2 - 6) /2 = 5

.

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