Question:
The strongest Lewis acid among boron halides is
The strongest Lewis acid among boron halides is
Updated On: Jun 14, 2022
- $ BBr_{3}$
- $ BCl_{3}$
- $ BI_{3}$
- $ BF_{3}$
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The Correct Option is C
Solution and Explanation
Generally, as the electronegativity increases, acidic character increases but in case of boron halides, $BI _{3}$ is most acidic, ie, strongest Lewis acid. This is because there is back donation of electrons from $F$ atom to boron in case of $BF _{3}$. This makes the $BF _{3}$ less electron deficient. The tendency of back donation decreases as the size of halogen atom increases (due to large energy difference). Hence, $BI _{3}$ is most electron deficient and thus, the strongest Lewis acid.
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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:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family