From the given set of species which do/does not require vacant orbital for dimer formation.
$BH_{3}, NO_{2}, A lC l_{3}, CH_{3} COO H_{(v a p .)}, C H_{3}, C F_{3}, A lB r_{3}$

Question

From the given set of species which do/does not require vacant orbital for dimer formation. BH 3 ​ , NO 2 ​ , A lC l 3 ​ , CH 3 ​ COO H ( v a p . ) ​ , C H 3 ​ , C F 3 ​ , A lB r 3 ​

TestHub · Accepted Answer

Free radicals (NO₂, ⋅CH₃, and ⋅CF₃) contain an unpaired electron and dimerize by simply pairing these electrons to form a standard covalent bond without needing vacant orbitals.

Acetic acid (CH₃COOH) forms a stable cyclic dimer in the vapor state through intermolecular hydrogen bonding, which also does not involve vacant orbitals.

In contrast, BH₃, AlCl₃, and AlBr₃ are electron-deficient molecules that strictly require vacant orbitals to accept electron pairs during dimerization (forming 3-center bonds or coordinate bonds).

Chemistry - CHEMICAL BONDING Question with Solution | TestHub

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