Match List I with List II
|
List I (Conversions) |
List II (Catalysis) |
| (A) \(SO_2 \longrightarrow H_2SO_4\) | I. \(Fe\) |
| (B) \(\text{Ethene }\longrightarrow \text{Polythene}\) | II. \(PdCl_2\) |
| (C) \(N_2 + 3H_2 \longrightarrow 2NH_3\) | III. \(V_2O_5\) |
| (D) \(\text{Ethyne} \longrightarrow \text{Ethanal}\) | IV. Ziegler Natta |
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → A-III, B-IV, C-I, D-II
(A) SO2 → H2SO4 — This matches (III) V2O5. In the Contact process \( \ce{SO2} \) is oxidised to \( \ce{SO3} \) over vanadium pentoxide:
\( \ce{2SO2 + O2} \xrightarrow{\ce{V2O5}} \ce{2SO3} \)
(B) Ethene → Polythene — This matches (IV) Ziegler Natta. Polythene is made with the Ziegler catalyst, triethylaluminium and titanium tetrachloride:
\( n\,\ce{CH2=CH2} \xrightarrow{\ce{(C2H5)3Al + TiCl4}} \ce{-[CH2-CH2]_{n}-} \)
(C) N2 + 3H2 → 2NH3 — This matches (I) Fe. In Haber’s process finely divided iron is the catalyst:
\( \ce{N2 + 3H2} \xrightarrow{\text{Fe, Mo}} \ce{2NH3} \)
(D) Ethyne → Ethanal — This matches (II) PdCl2. The book names \( \ce{PdCl2} \) as the catalyst of the Wacker process.
Note: Item (D) says “Ethyne → Ethanal”. This wording is often quoted in textbooks, but the Wacker process actually oxidises ethene to ethanal:
\( \displaystyle \ce{CH2=CH2 + PdCl2 + H2O -> CH3CHO + Pd + 2HCl} \)
NCERT (2026-27 edition):
Some Applications of d- and f-Block Elements – “… Many of the metals and/or their compounds are essential catalysts in the chemical industry. V2O5 catalyses the oxidation of SO2 in the manufacture of sulphuric acid. TiCl4 with Al(CH3)3 forms the basis of the Ziegler catalysts used to manufacture polyethylene (polythene). Iron catalysts are used in the Haber process for the production of ammonia from N2/H2 mixtures. … In the Wacker process the oxidation of ethyne to ethanal is catalysed by PdCl2.”