Q. Which of the following is not a correct statement ?
A) The electron-deficient molecules can act as Lewis acids
B) The canonical structures have no real existence
C) Every AB₅ molecule does in fact have square pyramid structure
D) Multiple bonds are always shorter than corresponding single bonds
Explanation
[Solution from source] AB₅ molecules with no lone pair, such as PCl₅, are trigonal bipyramidal; only those with a lone pair (AB₅E, e.g. BrF₅) are square pyramidal. So the claim that every AB₅ molecule is square pyramidal is false. The other three statements are standard facts. Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.