The compound(s) which react(s) with $\mathrm{NH}_{3}$ to give boron nitride (BN) is(are)

(B) $\mathrm{B}_{2} \mathrm{H}_{6}$; (C) $\mathrm{B}_{2} \mathrm{O}_{3}$

JEE Advanced · 2022 · 28 Aug 2022 · Paper 2 · p-Block Elements

The compound(s) which react(s) with

NH_{3}

to give boron nitride (BN) is(are)

Answer: (B), (C)

Option (A): Elemental boron (B) does react with ammonia to form BN, but the question asks for compounds, not elements. Excluded.

Option (B):

B_{2} H_{6}

reacts with

NH_{3}

to form borazine

B_{3} N_{3} H_{6}

, which on heating yields boron nitride (BN). Correct.

Option (C):

B_{2} O_{3}

reacts with

NH_{3}

at high temperature (1200°C) to directly form BN:

B_{2} O_{3} + 2 NH_{3} 1200° C 2 BN + 3 H_{2} O

Correct.

Option (D):

HBF_{4}

reacts with

NH_{3}

to form

NH_{4} [BF_{4}]

, not BN. Incorrect.

JEE Advanced · 2022 · 28 Aug 2022 · Paper 2 · One or more correct options