Match List-I with List-II.
| List-I (Compound) | List-II (Use) |
|---|---|
| (A) Formaldehyde | (I) In perfumery and in dye industries |
| (B) Acetaldehyde | (II) As a solution to preserve biological specimens |
| (C) Benzaldehyde | (III) As a common industrial solvent |
| (D) Ethyl methyl ketone | (IV) As a starting material in the manufacture of acetic acid and ethyl acetate |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → A-II, B-IV, C-I, D-III
In chemical industry, aldehydes and ketones are used as solvents, as starting materials and as reagents for making other products; many of them are also known for their odours and flavours.
(A) Formaldehyde — This matches (II) As a solution to preserve biological specimens. Its 40% solution in water is formalin. Formaldehyde is also used to make bakelite and urea-formaldehyde glues.
(B) Acetaldehyde — This matches (IV) As a starting material in the manufacture of acetic acid and ethyl acetate. It is also the starting material for vinyl acetate, polymers and drugs.
(C) Benzaldehyde — This matches (I) In perfumery and in dye industries.
(D) Ethyl methyl ketone — This matches (III) As a common industrial solvent. Acetone is the other ketone used in this way.
NCERT (2026-27 edition):
8.5 Uses of Aldehydes and Ketones – “…Formaldehyde is well known as formalin (40%) solution used to preserve biological specimens and to prepare bakelite (a phenol-formaldehyde resin), urea-formaldehyde glues and other polymeric products. Acetaldehyde is used primarily as a starting material in the manufacture of acetic acid, ethyl acetate, vinyl acetate, polymers and drugs. Benzaldehyde is used in perfumery and in dye industries. Acetone and ethyl methyl ketone are common industrial solvents.”