MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryIonic equilibriumPrevious Year Questions

Which of the following is least likely to behave as Lewis’s base? (AIPMT 2011)

A.OH–

B.H₂O

C.NH₃

D.BF₃✓ Correct

Explanation

3 BF is 2 sp hybridized with trigonal planar structure. The central atom present in these have incomplete octet due to shortage of electrons. It can accept electrons from any Lewis’s base and can act as Lewis’s acid. Therefore, it is least likely to behave as base.

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