Chemistry Chemical Bonding and Molecular Structure JEE Advanced Previous Years Question Single Correct MCQ
Published on: August 13, 2026

Statement -1 : Boron always forms covalent bond, because

Statement -2 : The small size of B 3+ favours formation of covalent bond.

A
Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.
B
Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1.
C
Statement-1 is True, Statement-2 is False.
D
Statement-1 is False, Statement-2 is True.

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The correct answer is:
A

Due to small size of B, it is very difficult to remove the electrons from boron to form ionic bond as it will require very high energy. On the other hand, due to its very small size having high polarising power causes greater polarisation and eventually significant covalent character according to Fajan's rule.

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