Why boron halides do not exist as dimers whereas AlCl3 exists as Al2C – InterviewSolution

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1.	Why boron halides do not exist as dimers whereas AlCl3 exists as Al2Cl6?
Answer» Boron atom being small in size is unable to accommodate large sized halogens around it. While in AlCl₃, Al atom has large size. They make use of vacant p-orbitals by coordinate bond i.e., metal atoms complete their octet by forming dimers, Al₂Cl₆.

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