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

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
$A l C l_{3}$ has the three-centre two-electron bonds in its dimeric structure
$B H_{3}$ has the three-centre two-electron bonds in its dimeric structure
The Lewis acidity of $B C l_{3}$ is greater than that of $A l C l_{3}$

Solution

(i)

(ii)

(iii)

(iv) Lewis acidic strength decreases down the group. The decrease in acid strength occurs because as size increases, the attraction between the incoming electron pair and the nucleus weakens.

Hence Lewis acidic strength of $B C l_{3}$ is more than $A l C l_{3} .$

Asked in: JEE Advanced 2017 (Paper 2)

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