(a)(i) It is an atom or group of bonded atoms that is responsible for the chemical behaviour of an organ compound
(ii)(I) — OH or hydroxyl group or alkanol
(C) C\(_4\) H\(_8\) + H\(_2\)SO\(_4\) \(\to\) C\(_4\)H\(_8\)HSO\(_4\)
C\(_4\)H\(_9\)HSO\(_4\) + H\(_2\)O \(\to\) C\(_4\)H\(_8\)OH + H\(_2\)SO\(_4\)
OR
CH\(_2\) = CHCH\(_2\)CH + H\(_2\)O \(\to\) CH\(_3\)OHCHCH\(_2\)CH\(_3\)
OR
C\(_4\)H\(_8\) + H\(_2\)O \(\to\) C\(_4\)H\(_8\)OH
(d)(i) (I) Conc. H\(_2\)SO\(_4\) / H\(_3\)PO\(_4\)
(II) Acidified KMnO\(_4\) / K\(_2\)Cr\(_2\)O\(_7\) / Na\(_2\)Cr\(_2\)O\(_7\)
(Ill) Ethanol and Conc. H\(_2\)SO\(_4\)
(e)(i) (I) Effervescence occurs (II) Yellow precipitate (III) Bromine water decolourized
(ii) (I)
or — COOH or alkanoic group
(II) CH\(_3\)CHOH / CH\(_3\) adjacent to CHOH
(III) C = C or carbon — carbon double bond