Among the following, the correct statement(s) is(are):

A l (C H_{3})_{3}

has the three-centre two-electron bonds in its dimeric structure

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B H_{3}

has the three-centre two-electron bonds in its dimeric structure

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A l C l_{3}

has the three-centre two-electron bonds in its dimeric structure

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The Lewis acidity of

B C l_{3}

is greater than that of

A l C l_{3}

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Solution

The correct options are
A $A l (C H_{3})_{3}$ has the three-centre two-electron bonds in its dimeric structure
B $B H_{3}$ has the three-centre two-electron bonds in its dimeric structure
D The Lewis acidity of $B C l_{3}$ is greater than that of $A l C l_{3}$
Both $A l (C H_{3})_{3}$ and $B H_{3}$ has 3c - 2e bonds in the dimeric structure.

$B C l_{3}$ is stronger Lewis acid than $A l C l_{3}$ , $A l C l_{3}$ exist as dimer in gaseous state which completes its octet whereas $B C l_{3}$ is having weak $π$ back bonding. Also, the small size of boron contributes to it.

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