Q.80 Chemistry ⭐ 360° Option Elimination Active

NEET 2025 Chemistry Question 80 Solution

Topic: The d- and f-Block Elements & Coordination Compounds · Official NTA Booklet Code 45

Question

Match List - I with List - II. List I: A. Haber process; B. Wacker oxidation; C. Wilkinson catalyst; D. Ziegler catalyst. List II: I. Fe catalyst; II. PdCl₂; III. [(PPh₃)₃RhCl]; IV. TiCl₄ with Al(CH₃)₃. Choose the correct answer from the options given below:

✓

Verified Against NTA Final Answer Key

Option (3) : A-I, B-II, C-III, D-IV

📚 The d- and f-Block Elements & Coordination Compounds Easy

📋 Given Parameters & Problem Setup

List I (Processes/Catalysts) A. Haber process, B. Wacker oxidation, C. Wilkinson catalyst, D. Ziegler catalyst

List II (Catalyst Formulations) I. Fe catalyst, II. PdCl₂, III. [(PPh₃)₃RhCl], IV. TiCl₄ with Al(CH₃)₃

⚡

The 30-Second Exam Hall Shortcut: ⚡ Named Catalysts 1-to-1 Sequence Match

⏱️ Save ~30 seconds

Haber = Fe (A-I). Wacker oxidation = PdCl₂ (B-II). Wilkinson = Rh complex [(PPh₃)₃RhCl] (C-III). Ziegler-Natta = TiCl₄ + AlR₃ (D-IV)! Perfect sequential match: A-I, B-II, C-III, D-IV!

1 A. Haber process: Industrial synthesis of ammonia (N₂ + 3H₂ ⇌ 2NH₃) uses Iron (Fe) catalyst with K₂O/Al₂O₃ promoter ⟹ A matches I.

2 B. Wacker process: Oxidation of ethene to ethanal (acetaldehyde) uses Palladium chloride (PdCl₂) with CuCl₂ ⟹ B matches II.

3 C. Wilkinson’s catalyst: Homogeneous hydrogenation of alkenes uses chloridotris(triphenylphosphine)rhodium(I), [(PPh₃)₃RhCl] ⟹ C matches III.

4 D. Ziegler-Natta catalyst: Coordination polymerization of alkenes uses Titanium tetrachloride (TiCl₄) with trialkylaluminium (Al(CH₃)₃ or Al(C₂H₅)₃) ⟹ D matches IV.

5 Sequential match: A-I, B-II, C-III, D-IV.

6 Select Option (3) in under 10 seconds!

🛡️

Why You Can 100% Trust This Shortcut: Variable Oxidation States & Catalytic Mechanisms of Transition Elements (NCERT Chemistry · d- and f-Block Elements).

📐

Step-by-Step Rigorous Workflow & Mathematical Proof

Step 1

Match Haber Process and Wacker Oxidation

Examine transition metal catalysts in major industrial processes from NCERT Chapter 8:

\text{Haber Process: } \text{N}_2 + 3\text{H}_2 \xrightarrow{\text{Fe catalyst}, \text{Mo/K}_2\text{O}} 2\text{NH}_3 \implies \text{A matches I}

• A matches I (A-I).
• Wacker Oxidation: Conversion of ethene into ethanal using aqueous PdCl₂ catalyst in the presence of CuCl₂ and air:
• \text{C}_2\text{H}_4 + \text{PdCl}_2 + \text{H}_2\text{O} \longrightarrow \text{CH}_3\text{CHO} + \text{Pd} + 2\text{HCl} \implies \text{B matches II (B-II)}.

Step 2

Match Wilkinson and Ziegler Catalysts

Examine organometallic and coordination complexes used in homogeneous and heterogeneous polymerizations:

\text{Wilkinson Catalyst: } [(\text{PPh}_3)_3\text{RhCl}] \implies \text{C matches III}

• Wilkinson’s catalyst is a square planar rhodium(I) complex used for selective homogeneous hydrogenation of double bonds.
• Ziegler-Natta Catalyst: A mixture of titanium tetrachloride and trialkylaluminium (TiCl₄ + Al(CH₃)₃ or Al(C₂H₅)₃), used for stereospecific polymerization of ethene into high-density polyethylene (HDPE): D matches IV (D-IV).

Step 3

Synthesize the Complete Match

Combine all four matches into the final answer:

\text{A-I, B-II, C-III, D-IV} \implies \text{Option (3)}

• Matches Option (3) perfectly.

⭐

360° Option Elimination Engine Key Feature

Diagnose every choice: Know exactly why the right option works and why distractors fail.

4-Option Deep Scan

1 A

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Swaps Wilkinson catalyst and Ziegler catalyst.

⚠️

Student Fallacy (Why candidates pick this trap): Confusing Rhodium with Titanium catalyst.

2 B

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Assigns PdCl₂ to Haber process.

⚠️

Student Fallacy (Why candidates pick this trap): Completely scrambled matches.

3 C

✓ 100% Correct

Verdict & Scientific Reason:

100% correct. Direct sequential match of all canonical NCERT catalysts.

💡

Why this is airtight: None; textbook mastery of transition metal catalysis.

4 D

✗ Incorrect

Verdict & Scientific Reason:

Incorrect. Swaps Wacker oxidation and Ziegler catalyst.

⚠️

Student Fallacy (Why candidates pick this trap): Assigning TiCl₄ to Wacker process.

⚠️

NTA Trap Alert: Swapping Wilkinson and Ziegler Catalysts

Option 1 swaps Wilkinson (Rh) and Ziegler (Ti). Remembering that Wilkinson’s catalyst is the famous Rhodium complex [(PPh₃)₃RhCl] easily prevents this confusion.

🛡️ How to avoid the -1 mark: Remember: Wilkinson = Rhodium (Rh); Ziegler-Natta = Titanium (Ti) + Aluminium (Al)!

📖

Core NEET Syllabus Standard

NEET Chemistry Core Syllabus · The d- and f-Block Elements Standard Benchmark

Core Scientific Principle Tested:

"Haber = Fe, Wacker = PdCl₂, Wilkinson = [(PPh₃)₃RhCl], Ziegler = TiCl₄ + AlR₃."

Syllabus Focus: Catalytic Properties of Transition Metals and Coordination Complexes

✓ Core NEET UG Syllabus Anchor Syllabus & Academic Standards ↗

Haber-Fe, Wacker-Pd, Wilkinson-Rh, Ziegler-Ti ⟹ 1, 2, 3, 4 straight down (Option 3)!

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NEET 2025 Chemistry Question 80 Solution

Question

The 30-Second Exam Hall Shortcut: ⚡ Named Catalysts 1-to-1 Sequence Match

Step-by-Step Rigorous Workflow & Mathematical Proof

Match Haber Process and Wacker Oxidation

Match Wilkinson and Ziegler Catalysts

Synthesize the Complete Match

360° Option Elimination Engine Key Feature

NTA Trap Alert: Swapping Wilkinson and Ziegler Catalysts

Core NEET Syllabus Standard

Ready to attempt under real exam pressure?

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