Courses
Courses for Kids
Free study material
Offline Centres
More
Store Icon
Store
seo-qna
SearchIcon
banner

When a mixture of diborane and ammonia is heated, the final product is:
(A) BH3
(B) NH4BH4
(C) NH2NH2
(D) B3N3H6

Answer
VerifiedVerified
498.6k+ views
3 likes
like imagedislike image
Hint: Recollect the concept of bonding in boranes and their reactions. Boron will react with ammonia to form an intermediate which will decompose to give the final product. The final product might be similar to benzene.

Complete step by step answer:
-Boron is a non-metal having atomic number 5. Boron forms only covalent compounds. Boron hydride, BH3 is quite stable in its dimeric form, also known as diborane, B2H6.
-Diborane is a boron hydride formed by dimerization of two borane molecules. It is the most stable form of borane.
-Diborane is highly reactive when exposed to air and catches fire spontaneously.
-When diborane reacts with ammonia, an addition product that is, an adduct is formed when further decomposes on heating at 473K to form a volatile compound called borazine or borazole.

3B2H6+6NH33[BH2(NH3)2]+[BH4]
3[BH2(NH3)2]+[BH4]473K2B3N3H6+12H2

-Borazine is isostructural to benzene and hence, it is known as inorganic benzene.
seo images

-Borazole consists of alternate boron and nitrogen atoms having alternate single and double bonds. It has three double bonds and has 6π electron system which is similar to benzene.
-Borazine has the molecular formula, B3N3H6.
So, the correct answer is “Option D”.

Additional Information:
In diborane, there is presence of two 3-centre-2-electron bonds also known as banana bonding. This banana bond is formed during dimerization of BH3. 1s orbital of one hydrogen having one electron overlaps with one 2p orbital having one electron of one boron atom and one vacant 2p orbital of another boron atom to form this type of bonding.

Note: Revise the concept of boron. Remember diborane is stable due to banana bonding and borazine or borazole is isostructural with benzene.
Latest Vedantu courses for you
Grade 10 | MAHARASHTRABOARD | SCHOOL | English
Vedantu 10 Maharashtra Pro Lite (2025-26)
calendar iconAcademic year 2025-26
language iconENGLISH
book iconUnlimited access till final school exam
tick
School Full course for MAHARASHTRABOARD students
PhysicsPhysics
BiologyBiology
ChemistryChemistry
MathsMaths
₹36,600 (9% Off)
₹33,300 per year
Select and buy