Which of the following are conjugated dienes?

APenta-1,3-diene
B2-Methylbuta-1,3-diene
CCyclohexa-1,4-diene
DCyclopenta-1,3-diene

Answer: A, B, D

Conjugated dienes have two double bonds separated by exactly one single bond. This holds for penta-1,3-diene, isoprene and cyclopenta-1,3-diene. In cyclohexa-1,4-diene a

CH X_{2}

separates the double bonds, so it is not conjugated.

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