Chemistry - GOC Question with Solution | TestHub

(a) $\mathrm{C}=\mathrm{C}-\mathrm{C}\equiv \mathrm{C}$ is a conjugated ene-yne. (b) C=C-C=O is a conjugated enone. (d) The vinyl group is conjugated with the ring.

(c) The two $\mathrm{C}=\mathrm{C}$ are separated by an $\mathrm{s}{\mathrm{p}}^3$ carbon. (e) In allene the double bonds are cumulated (adjacent), not conjugated.

Only (a), (b) and (d).