ABC26IN0179 · Main Group Elements

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
$\mathrm{BCl_3}$: $p\pi$-$p\pi$ back bonding. $\mathrm{BCl_3} > \mathrm{BPh_3} > \mathrm{BMe_3}$

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