JEE Main201815 Apr 2018Morning ShiftChemistryChemical Bonding and Molecular StructureActual

The decreasing order of bond angles in BF ₃, NH ₃, PF ₃ and I ₃⁻ is :

Options

AI ₃⁻> BF ₃> NH ₃> PF ₃
BBF ₃> I ₃⁻> PF ₃> NH ₃
CBF ₃> NH ₃> PF ₃> I ₃⁻
DI ₃⁻> NH ₃> PF ₃> BF ₃

Correct answer

A. I ₃⁻> BF ₃> NH ₃> PF ₃

Step-by-step solution

B is s p^2 , Bond angle =120^ N is s p^3 with 1 ~l p, Bond angle =107^ P is s p^3 with 1 ~l p , when central atom size , bond angle , NH ₃> PF ₃ I is s p^3 d (linear), Bond angle =180^ Decreasing order of bond angle I ₃⁻> BF ₃> NH ₃> PF ₃

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