Question

Which of the following is not statement? 

(a) Multiple bonds are always shorter than corresponding single bonds. 

(b) The electron-deficient molecules can act as Lewis acids.

(c) The canonical structures have no real existence.

(d) Every AB₅ molecule does in fact have square pyramid structure.

Answer 1

The correct option is : (d) Every AB₅ molecule does in fact have square pyramid structure.

Explanation: 

For, AB₅ molecules, there are three possible geometries i.e. planar pentagonal. square pyramidal and trigonal bipyramidal.

Out of these three geometries, it is only trigonal pyramidal shape in which bond pair-bond pair repulsions are minimum and hence this geometry is the most probable geometry of AB₅ molecule.