Formaldehyde is the first member of the aldehyde series. It is present in green leaves of plants where its presence is supposed to be due to the reaction of \(CO_2\) with water in the presence of sunlight and chlorophyll. Commercially, formaldehyde is obtained by the controlled oxidation of methane in the presence of molybdenum oxide \((MoO)\) acting as a catalyst. Formaldehyde is a constituent of a number of polymers also called resins. These are non volatile solids or semi solids which are obtained directly from certain plants and can be synthesized in the laboratory.
Match List I with List II
| List I | List II |
| A. Bakelite formaldehyde resin | I. Condensation polymers |
| B. Melamine formaldehyde resin | II. Phenol and formaldehyde |
| C. Urea formaldehyde resin | III. Melamine and formaldehyde |
| D. Bakelite & Melamine formaldehyde resin | IV. Unbreakable cups and laminated sheets |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-II, B-III, C-IV, D-I
(A) Bakelite formaldehyde resin — (II) Phenol and formaldehyde. Bakelite is the phenol–formaldehyde resin formed by condensation of phenol with formaldehyde.
(B) Melamine formaldehyde resin — (III) Melamine and formaldehyde. It is formed by condensation polymerisation of melamine and formaldehyde.
(C) Urea formaldehyde resin — (IV) Unbreakable cups and laminated sheets. Urea–formaldehyde resin is used for unbreakable cups and laminated sheets.
(D) Bakelite & Melamine formaldehyde resin — (I) Condensation polymers. Both are formed by repeated condensation with loss of water molecules.
Note: This question is from the pre-rationalised NCERT book (2022-23). The topic is not there in the latest NCERT book (2026-27), and it is also out of the CUET 2026 syllabus.