Which of the following compounds contain all the carbon atoms in the same hybridisation state?
A. H—C ≡ C—C ≡ C—H

B. CH₃—C ≡ C—CH₃

C. CH₂ = C = CH₂

D. CH₂ = CH—CH = CH₂

(i) is an alkyne compound having 2 sets of triple bonds. Here each carbon has 2 sigma bonds and 2 pi bonds, therefore each carbon is ‘sp’ hybridized.

(iv) is an alkene with two sets of double bonds. Each carbon has three sigma bonds and one pi bond, each carbon exhibiting ‘sp²’ hybridization.