Ncert Exercises & Solutions

A reaction between ammonia and boron trifluoride is given below.

$: {NH}_{3} + {BF}_{3} \to H_{3} N : {BF}_{3}$

Identify the acid and base in the reaction. Which theory explains it? What is the hybridisation of B and N in the reactants?

Although BF₃ does not have a proton but acts as Lewis acid as it is an electron deficient compound. It reacts with NH₃ by accepting the lone pair of electrons from NH₃ and complete its octet. The reaction can be represented by

{BF}_{3} + : {NH}_{3} \to {BF}_{3} \leftarrow {NH}_{3}

Lewis electronic theory of acids and bases can explain it. Boron in BF₃ in sp² hybridised where N in NH₃ is sp³ hybridised.

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