8(iv)
The structures of six organic compounds are shown:
(a) Identify two of the compounds that are members of the same homologous series but are not isomers.
(b) Which two compounds are isomers of each other?
(c) F can be prepared from D. Give a chemical equation for the reaction.
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(a) A and F
(b) C and E
(c) C2H5OH $\xrightarrow[170^{\circ}\text{C}]{\text{Conc. H}_2\text{SO}_4}$ C2H4 ↑ + H2O
Reason
(a) Butene (C4H8) and Ethene (C2H4) are members of homologous series of alkenes and are not isomers.
(b) Both C and E have the same molecular formula (C4H10) but different structure. C is n-butane and E is iso-butane.
(c) Ethene (C2H4) can be prepared by the dehydration of ethyl alcohol (C2H5OH).