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Count the rings and pi bonds in the compound shown. Its degree of unsaturation is

A $1$
B $2$
C $3$
D $4$

Answer: B

The compound shown is but-2-enoic acid (crotonic acid),

C X_{4} H X_{6} O X_{2}

. It has one C=C and one C=O and no ring, so the degree of unsaturation is 2. Formula check:

(8 + 2 - 6) /2 = 2

.

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