Q54 · CSIR-NET Chemistry, December 2011

Paper: CSIR-NET December 2011 · Subject: Inorganic Chemistry · Chapter: Main Group Elements · Topic: Main Group Elements – General · 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: A ✓ checked by 4AB · confidence medium
Explanation
Toward pyridine: BCl₃ > BPh₃ > BMe₃ (a).

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