Multiple choice

Assertion: BF3 is a weaker Lewis acid than BBr3. Reason: BF3 has planar geometry and is stabilised to a greater extent than BBr3 by pπ-back bonding.

  1. Both A and R are true and R is the correct explanation of A.

  2. Both A and R are true, but R is not the correct explanation of A.

  3. A is true but R is false.

  4. A is false but R is true.

  5. Both A and R are false.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

BF3 is a weaker Lewis acid than BCl3 because of the greater pπ-pπ back bonding effect in BBr3. BF3 and BBr3 both have sp2 hybridisation with trigonal planar geometry.

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