Question

In spite of having nearly same electronegativity oxygen forms h bonding by cl does not

Answer 1

Hey !!

Although O and Cl have about the same electronegativity, yet their atomic size (covalent radii) are much different : O = 66 pm and Cl = 99 pm.

As a result, electron density per unit volume on oxygen atom is much higher than that on chlorine atom. Therefore, oxygen forms hydrogen bonds whole chlorine does not even though both have approx. the same electronegativity.

GOOD LUCK !!