Question

Among the following, which is an incorrect statement.

(a) PH₅ and BiCl₅ do not exist

(b) pπ - dπ bonds are present in SO₂

(c) SeF₄ and CH₄ have same shape

(d) \(I^+_3\) has bent structure

Answer 1

Answer is : (c) SeF₄ and CH₄ have same shape

PH₅ does not exist due to very less electronegativity difference between P and H. Hydrogen is slightly more electronegative than phosphorus, thus could not hold significantly the sharing electrons. On the other hand, BiCl₅ does not exist due to inert pair effect. This is because on moving down the group, +5 oxidation state becomes less stable while +3 oxidation state become more stable due to inert pair effect.

In SO₂, pπ-dπ and pπ-pπ both types of bonds are present.

SeF₄ has sp³ d-hybridisation whereas CH₄ has sp³ -hybridisation. Thus, they both have different geometry.

\(I^+_3\) has a bent shape due to the presence of 2 lone pairs on central I atom.