Lewis acidity of BCl₃, BPh₃ and BMe₃ with respect to pyridine follows the order · ABC26IN0179

Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · Exam: CSIR NET 2011 · Marks: 2 · Difficulty: Medium

Lewis acidity of $\mathrm{BCl_3}$, $\mathrm{BPh_3}$ and $\mathrm{BMe_3}$ with respect to pyridine follows the order

(a)$\mathrm{BCl_3} > \mathrm{BPh_3} > \mathrm{BMe_3}$

(b)$\mathrm{BMe_3} > \mathrm{BPh_3} > \mathrm{BCl_3}$

(c)$\mathrm{BPh_3} > \mathrm{BMe_3} > \mathrm{BCl_3}$

(d)$\mathrm{BCl_3} > \mathrm{BMe_3} > \mathrm{BPh_3}$

Answer

Answer (as printed): A

Explanation

BCl→ pπ→-pπ back bonding BCl> BPh3 > BMe3

Explanation as extracted from the printed page; notation may be imperfect.

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