Question:

The tendency of $ {BF_3, BCl_3}$ and $ {BBr_3}$ to behave as Lewis acid decreases in the sequence

Updated On: Jul 7, 2022
  • $\ce{BF3 > BCl3 > BBr3}$
  • $\ce{BCl_3 > BF_3 > BBr_3}$
  • $\ce{BBr_3 > BCl_3 > BF_3}$
  • $\ce{BBr_3 > BF_3 > BCl_3}$
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The Correct Option is C

Solution and Explanation

As the extent of $p\pi - p\pi$ back bonding decreases, electron-deficiency increases and hence the Lewis acid strength increases, i.e., option (c) is correct.
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Concepts Used:

P-Block Elements

  • P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
  • P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.

P block elements consist of: