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Which of the following is not a correct statement?

1. The canonical structures have no real existence
2. Every AB5 molecule does in fact have square pyramidal structure
3. Multiple bonds are always shorter than corresponding single bonds
4. The electron-deficient molecules can act as Lewis acids

Correct answer: Every AB5 molecule does in fact have square pyramidal structure

Solution

Option B is incorrect because not all AB5 molecules have a square pyramidal structure; for example, PCl5 has a trigonal bipyramidal geometry. The other statements are correct.

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