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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3nm056

Select the correct statements about the degree of unsaturation (DU) of the named compounds.

A4-Oxopent-2-enoic acid ( $C X_{5} H X_{6} O X_{3}$ ) has DU = 3.
BMethyl cyclohex-3-ene-1-carboxylate ( $C X_{8} H X_{12} O X_{2}$ ) has DU = 4.
CBenzoic acid ( $C X_{7} H X_{6} O X_{2}$ ) has DU = 5.
DCyclohexanecarbonitrile ( $C X_{7} H X_{11} N$ ) has DU = 4.

Answer: A, C

DU =

(2 C + 2 + N - H) /2

. For

C X_{5} H X_{6} O X_{3}

:

(12 - 6) /2 = 3

(true). For

C X_{7} H X_{6} O X_{2}

:

(16 - 6) /2 = 5

(true). For

C X_{8} H X_{12} O X_{2}

:

(18 - 12) /2 = 3

(ring, C=C, C=O), not 4 (false). For

C X_{7} H X_{11} N

:

(16 + 1 - 11) /2 = 3

(ring plus triple bond), not 4 (false).

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