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Boran trimethyl is a weaker Lewis acid than the boran trihalides (or) monoborane

Lewis acid property when $M e_{3} V$ is a donor is in order $B B r_{3} > B C l_{3} > B F_{3} \approx B H_{3} > B M e_{3}$

Lewis acid property when $M e_{3} P$ is a donor is in order $B B r_{3} > B C l_{3} \approx B H_{3} > B F_{3} \approx B M e_{3}$

Lewis acid property when CO is a donor : No adduct is formed with halides and Lewis acid property of $B H_{3} > > B F_{3} . B F_{3} . B M e_{3}$

answer is A, B, C, D.

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Detailed Solution

Boran atom in $B X_{3}$ molecule acquire $6 e^{-}$ in its outer shell. Hence acts as strong Lewis acid.

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