KCET2026ChemistryAldehydes and Ketones
Match List-I with List-II and select the correct options List-I (Functional group) List-II (Functional group reagent) (a) (i) Neutral ferric chloride test (b) C ₆ H ₅ NH ₂ (ii) Azo dye test (c) CH ₃ CH ₂ CHO (iii) Ceric ammonium nitrate test (d) (iv) Tollen's reagent test Codes:
Options
- Aa-iv, b-i, c-ii, d–iii
- Ba-iii, b-ii, c-iv, d–i
- Ca-iii, b-ii, c-i, d–iv
- Da-ii, b-iii, c-iv, d–i
Correct answer
B. a-iii, b-ii, c-iv, d–i
Step-by-step solution
(a) The first compound is 2-butanol, which is an aliphatic alcohol. Aliphatic alcohols give a positive ceric ammonium nitrate test, producing a red colouration. Thus, (a) matches with (iii). (b) C ₆ H ₅ NH ₂ is aniline, a primary aromatic amine. It gives a positive azo dye test by reacting with nitrous acid to form a diazonium salt, which couples with -naphthol to form an orange-red dye. Thus, (b) matches with (ii). (c) CH ₃ CH ₂ CHO is propanal, an aldehyde. Aldehydes reduce Tollen's reagent to form a silver mirro