Match: (a) Chlorophyll, (b) Vitamin-B₁₂, (c) Anticancer drug, (d) Grubbs catalyst with (i) Ru, (ii) Pt, (iii) Co, (iv)…
Coordination Compounds · Class 12 · JEE Main Previous Year Question
Match: (a) Chlorophyll, (b) Vitamin-B₁₂, (c) Anticancer drug, (d) Grubbs catalyst with (i) Ru, (ii) Pt, (iii) Co, (iv) Mg
- a
a-iii, b-ii, c-iv, d-i
- b✓
a-iv, b-iii, c-ii, d-i
- c
a-iv, b-iii, c-i, d-ii
- d
a-iv, b-ii, c-iii, d-i
a-iv, b-iii, c-ii, d-i
🧠 Four Anchors, Four Metals
JEE keeps recycling four bio/industrial pairings:
- Chlorophyll → Mg (green pigment)
- Vitamin B₁₂ → Co (cobalamin)
- Anticancer drug (cisplatin) → Pt
- Grubbs catalyst (olefin metathesis) → Ru
Once these are anchored, any matching question collapses to a label exercise.
🗺️ Pin the Pairs
(a) Chlorophyll → Mg → (iv) (b) Vitamin B₁₂ → Co → (iii) (c) Anticancer drug (cisplatin, -) → Pt → (ii) (d) Grubbs catalyst → Ru → (i)
That's exactly option (2): a-iv, b-iii, c-ii, d-i.
⚡ Mnemonic
"Mg grows my garden, Cobalt fixes my Blood (B₁₂), Pt fights tumours, Ru rides olefins (Grubbs)." Lock this once.
⚠️ Don't Confuse the Catalyst Family
Grubbs (Ru) and Wilkinson (Rh) both end in transition metals starting with R, both are organometallic catalysts, both have phosphine ligands. They are different metals doing different jobs (metathesis vs hydrogenation). Mixing them is the classic Hard-level distractor in option (3) of similar questions.
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More JEE Main Coordination Compounds PYQs
Identify the incorrect pair from the following:
The mismatched combinations are: A. Chlorophyll – Co B. Water hardness – EDTA C. Photography – [Ag(CN)2]- D. Wilkinson catalyst – [(Ph3P)3RhCl] E. Chelating ligand – D-Penicillamine
To inhibit the growth of tumours, identify the compounds used from the following: (A) EDTA (B) Coordination Compounds of Pt (C) D-Penicillamine (D) Cis-Platin
The compound used in the treatment of lead poisoning is:
The compound that inhibits the growth of tumors is: