1. CN^- > C₆H₅^- > Br^- > NH₃ 2. Br^- > CN^- > NH₃ > C₆H₅^- 3. CN^- > Br^- > C₆H₅^- > NH₃ 4. NH₃ > CN^- > Br^- > C₆H₅^-

Answer: 1. CN^- > C₆H₅^- > Br^- > NH₃ Key idea: trans-effect series: strong pi-acceptors and strong sigma-donors are highest, while NH₃ is low. The standard order of trans-effect is CN^->C₆H₅^->Br^->NH₃ , which is what option 1 gives. Note: this order is written from highest to lowest, although the stem says "increasing".

Topic: Werner's theory, ligands, coordination number, denticity, chelation· Coordination Compounds

The correct increasing order of trans-effect of the following species is

1. \(CN^- > C_6H_5^- > Br^- > NH_3\)

2. \(Br^- > CN^- > NH_3 > C_6H_5^-\)

3. \(CN^- > Br^- > C_6H_5^- > NH_3\)

4. \(NH_3 > CN^- > Br^- > C_6H_5^-\)

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 2 Practice test neet Save WhatsApp Report

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Answer: 1. \(CN^- > C_6H_5^- > Br^- > NH_3\)

Key idea: trans-effect series: strong pi-acceptors and strong sigma-donors are highest, while \(NH_3\) is low.

The standard order of trans-effect is \(CN^->C_6H_5^->Br^->NH_3\), which is what option 1 gives.

Note: this order is written from highest to lowest, although the stem says "increasing".

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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The correct increasing order of trans-effect of the following species is

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