For AB, type molecule, which statement(s) is (are) correct about bond angle (B-A-B)
I. Bond angle $\propto$ 1 / EN of atom B.
II. Bond angle $\propto$ EN of atom B.
III. Molecules or ions without non-bonding electrons on
central atom and having regular geometry, the change in
EN of A or B has no effect on the bond angle.
IV. The bond angle in compounds having sp, sp² and sp³
hybridisation on central atom decreases as follows:
sp>sp²>sp³

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I, IV

II, IV

I, II, III

I, II, IV

answer is A.

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Detailed Solution

1.as electronegativity of B decreases bond angle increases due to increase in repulsions around central atom.

4. $SP = 180^{0}; {SP}^{2} = 120^{0}; {SP}^{3} = 109 . 5^{0}$

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