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Which of the following is not a correct statement?    
  • a)
    Every AB5 molecule does in fact have square pyramid structure.    
  • 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 no real existence.
Correct answer is option 'A'. Can you explain this answer?
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Which of the following is not a correct statement? a)Every AB5 molecul...
IF5 is square pyramid (sp3d2-hybridization in I); PCI5 is trigonal bipyramid (sp3d0hybridization in P)
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Which of the following is not a correct statement? a)Every AB5 molecul...
Explanation:
To determine which statement is not correct, let's analyze each option one by one.

a) Every AB5 molecule does in fact have square pyramid structure:
This statement is not correct. The AB5 molecules can have various structures depending on the central atom and the surrounding atoms. For example, PCl5 (phosphorus pentachloride) has a trigonal bipyramidal structure, not a square pyramid structure. Therefore, option 'a' is not a correct statement.

b) Multiple bonds are always shorter than corresponding single bonds:
This is a correct statement. Multiple bonds, such as double or triple bonds, involve the sharing of more electrons between atoms compared to single bonds. This increased electron density pulls the atoms closer together, resulting in shorter bond lengths.

c) The electron-deficient molecules can act as Lewis acids:
This is a correct statement. Lewis acids are electron acceptors, meaning they can accept a pair of electrons from another molecule or ion. Electron-deficient molecules, which have incomplete octets or electron deficiencies, can act as Lewis acids by accepting an electron pair.

d) The canonical structures have no real existence:
This is a correct statement. Canonical structures, also known as resonance structures, are used to represent the delocalization of electrons in molecules or ions. They are not actual representations of the molecule's structure but rather theoretical constructs used to describe its electronic structure.

Conclusion:
Out of the given options, option 'a' is the incorrect statement. AB5 molecules do not always have a square pyramid structure; their structure depends on the central atom and the surrounding atoms.
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Which of the following is not a correct statement? a)Every AB5 molecule does in fact have square pyramid structure. 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 no real existence.Correct answer is option 'A'. Can you explain this answer?
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