Question:

Which one of the following molecular hydrides acts as a Lewis acid?

Updated On: Jul 12, 2022
  • $ NH_3$
  • $H_2$O
  • $B_2H_6$
  • $CH_4$
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The Correct Option is C

Solution and Explanation

Electron deficient molecules $t$ as Lewis acid. Among the given molecules, only diborane is electron deficient, i.e. does not have complete octet . Thus, it acts as a Lewis acid. $ NH_3 \, and \, H_2O$ being electron rich molecules behave as Lewis base.
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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: