Select all of the structures shown that have a degree of unsaturation of 4. The compound drawn under the question is a reference with the same degree of unsaturation as one of them.

AStructure A
BStructure B
CStructure C
DStructure D

Answer: A, B

Structure A (toluene) has a ring and three C=C: 4. B (cyclohepta-1,3,5-triene) has a ring and three C=C: 4. C (cyclohex-2-enone) has a ring, C=C and C=O: 3. D (hex-1-en-3,5-diyne,

C X_{6} H X_{4}

) has one C=C and two C#C: 5. The reference (phenol) has DBE 4.

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Select all of the structures shown that have a degree of unsaturation of 4. The compound drawn under the question is a reference with the same degree of unsaturation as one of them.

Answer: A, B

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