Multiple choice

Which one of the following statement is/are true?

P. B3N3H6 is known as inorganic benzene. Q. Boric acid is a dibasic acid. R. Maximum covalence of boron cannot exceed 4. S. BF3 is a Lewis base.

Select the correct answer using codes given below.

  1. P and Q

  2. P and S

  3. Q and R

  4. Q and S

  5. R and S
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Boric acid is a weak monobasic acid. It is not a protonic acid but acts as a Lewis acid by accepting electrons from a hydroxyl ion: B(OH)3 + 2H2O → [B(OH)4]– + H3O+

The number of electrons around the central atom in BF3 is only six. Such electron deficient molecules have tendency to accept a pair of electrons to achieve stable electronic configuration and thus, behave as Lewis acids.

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