4(iii)
You are given the following molecular formulae of some hydrocarbons:
C5H8 C5H10 C8H14 C7H14 C6H6 C6H12
(a) Which two compounds represent unsaturated hydrocarbons having triple bonds?
(b) Identify the formula which represents a cyclic compound.
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(a) C5H8 and C8H14 — Both follow the general formula of alkynes, CnH2n-2, which contain a carbon–carbon triple bond.
(b) C6H6 — It represents benzene, a cyclic (aromatic) hydrocarbon.