Which of the following is not a correct statement ?

Options

A. Every `AB_5` molecule does in fact have square pyramind sructure
B. Multiple bonds are always shorter than corresponding single bonds
C. The electron-deficient molecules can act as Lewis acids
D. The canonical structures have non real existence

Answer

A

Explanation

`I` in `IF_5` is `sp^3 d^2 `-hybridised and thus square pyramidal P in `PCl_5` is ` sp^3` d-hybridised and thus trigonal biuramid .