Which of the following is not a correct statement?

1. Multiple bonds are always shorter than corresponding single bonds
2. The electron deficient molecules can act as Lewis acids
3. The canonical structures have no real existence
4. Every $\mathrm{AB}_5$ molecule does in fact have square pyramidal structure

Solution

The $\mathrm{AB}_5$ molecule does not have a square pyramidal structure but has a trigonal bipyramidal structure because of $s p^3 d$ hybridisation. Related Theory Benzene exist in canonical structure

Asked in: NEET 2006

Practice more Chemical Bonding and Molecular Structure questions on Aicharya