According to VBT any covalent bond will be formed by overlapping of atomic orbitals of bonded atoms provided atomic orbitals must be half-filled and electrons be in opposite spin. According to type of

Question

According to VBT any covalent bond will be formed by overlapping of atomic 
orbitals of bonded atoms provided atomic orbitals must be half-filled and 
electrons be in opposite spin. According to type of overlapping covalent bonds 
can be classified as (a) $\sigma$-bond (b) $\pi$-bond (c) $\delta$-bond:

Prashant Kotian · Accepted Answer

Correct answer: D. Step 1: Identify that ortho-fluorophenol (I) exhibits strong intramolecular hydrogen bonding, which significantly decreases its capacity to form intermolecular hydrogen bonds, thereby lowering its boiling point. Step 2: For ortho-chlorophenol (II) and ortho-bromophenol (III), intramolecular hydrogen bonding is weak or negligible due to the larger size of Cl and Br. Therefore, their boiling points are primarily governed by van der Waals forces, which increase with molecular size and weight (III > II). Step 3: Consequently, the boiling point order is III > II > I, which matches option (b).

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