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Due to intermolecular hydrogen bonding in methanol, it exists as associated molecule.

1. Statement (a), (c), (d) are correct. Statement (b) is incorrect statement.
2. AB5 may have two structures as follows:
3. Square Pyramidal
4. Trigonal Bipyramidal

Correct answer: Trigonal Bipyramidal

Solution

The correct structure for AB5 is Trigonal Bipyramidal, as it aligns with the VSEPR theory for a molecule with five bonding pairs and no lone pairs.

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