(a)(i) Homologous series is a series are family of organic compounds with a general molecular formula, similarity in property and differing from successive member by CH\(_2\) of 14 a.m.u.
(ii) Alkanes, alkenes, cycloalkar les and aromatics.
(iii) Alkane — methane; ethane, etc.
Alkene — ethene, propene, butene, etc
Cycloalkanes — cyclohexane,
cyclopropane Aromatic — benzene.

(iv) Gas Petroleum ether Gasoline (petrol) Gas oil/diesel oil Lubricating oil Biturhen Kerosine.
(v) Because of a steady change (increase or decrease) in molecular mass of tho constituents.

(b)(i)
I. C\(_2\)H\(_5\)OH\(_{(l)}\) + H\(_2\)SO\(_4\)\(_{(l)}\) \(\to\) C\(_2\)H\(_5\)HSO\(_4\)\(_{(l)}\) + H\(_2\)O\(_{(l)}\)
II. C\(_2\)H\(_5\)HSO\(_4\)\(_{(l)}\) \(\to\) C\(_2\)H\(_4\)\(_{(g)}\) + H\(_2\)SO\(_4\)\(_{(l)}\)

(ii) I. C\(_2\)H\(_5\)OH\(_{(l)}\) + H\(_2\)SO\(_4\)\(_{(l)}\) ---> C\(_2\)H\(_5\)HSO\(_4\)\(_{(l)}\) + H\(_2\)O\(_{(l)}\)
II. C\(_2\)H\(_5\)HSO\(_4\)\(_{(l)}\) \(\to\) C\(_2\)H\(_5\)OC\(_2\)H\(_5\)\(_{(l)}\) + H\(_2\)SO\(_4\)

(c)(i)
(I) C H O
52.0 13.3 34.7
12 1 16
4.33 13.3 2.17
2.17 2.17 2.17
1 6 1
Emperica formula = C\(_2\)H\(_6\)O
(II) (C\(_2\)H\(_6\)O)\(_n\) = 46
(12 x 2 + 6 x 1 + 16)\(_n\) = 46
46\(_n\) = 46
n = \(\frac{46}{46}\) = 1
molecular formula = C\(_2\)H\(_6\)O

(ii)