Answer
Verified
442.2k+ views
Hint: The Lewis base is a species having filled an orbital and an electron lone pair. The lone pair is not involved in bonding but it forms a dative bond with a Lewis acid.
The structure of diborane consists of boron and hydrogen. It has two borane atoms and four hydrogen atoms. The formula for diborane is ${{\text{B}}_{\text{2}}}{{\text{H}}_{\text{4}}}$.
Complete step by step answer:
The reaction of diborane with Lewis base is as follows:
Diborane on reaction with Lewis base (L) undergoes cleavage to give borane adduct ${\text{B}}{{\text{H}}_{\text{3}}}{\text{L}}$.
Consider the reaction of diborane with ammonia,
${\text{3}}{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{4}}} + 6{\text{N}}{{\text{H}}_3} \to 2{{\text{B}}_{\text{3}}}{{\text{N}}_3}{{\text{H}}_{\text{6}}}{\text{ + 12}}{{\text{H}}_2}$
Thus, ${{\text{B}}_{\text{3}}}{{\text{N}}_3}{{\text{H}}_{\text{6}}}$ is a borane adduct. ${{\text{B}}_{\text{3}}}{{\text{N}}_3}{{\text{H}}_{\text{6}}}$ is known as borazine. This reaction takes place at an elevated temperature ${180^ \circ } - {190^ \circ }{\text{C}}$.
So, the correct answer is Option B.
Additional Information:
The cleavage of diborane does not form boron trihydride.
Diborane on burning in air gives ${{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}$. The reaction is as follows:${{\text{B}}_{\text{2}}}{{\text{O}}_{\text{6}}} + 3{{\text{O}}_2} \to {{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}} + 3{{\text{H}}_2}{\text{O}}$.
Common properties of diborane are:
Diborane is colorless.
At room temperature, diborane is highly flammable. It is generally flammable in air.
It is a sweet smelling gas.
It hydrolyses in water and produces boric acid and hydrogen gas.
Note:
Examples of Lewis bases are:
1.Lone pair donors: ${\text{N}}{{\text{H}}_{\text{3}}}{\text{,}}\,{{\text{H}}_{\text{2}}}{\text{O, O}}{{\text{H}}^ - },{\text{ CH}}_3^ - $.
2.Simple anions: ${{\text{H}}^ - },{\text{ }}{{\text{F}}^ - }$.
3.Complex anions: ${\text{SO}}_4^{2 - },{\text{ PO}}_4^{3 - }$.
$\pi $-systems rich in electron: ethyne, benzene.
The structure of diborane consists of boron and hydrogen. It has two borane atoms and four hydrogen atoms. The formula for diborane is ${{\text{B}}_{\text{2}}}{{\text{H}}_{\text{4}}}$.
Complete step by step answer:
The reaction of diborane with Lewis base is as follows:
Diborane on reaction with Lewis base (L) undergoes cleavage to give borane adduct ${\text{B}}{{\text{H}}_{\text{3}}}{\text{L}}$.
Consider the reaction of diborane with ammonia,
${\text{3}}{{\text{B}}_{\text{2}}}{{\text{H}}_{\text{4}}} + 6{\text{N}}{{\text{H}}_3} \to 2{{\text{B}}_{\text{3}}}{{\text{N}}_3}{{\text{H}}_{\text{6}}}{\text{ + 12}}{{\text{H}}_2}$
Thus, ${{\text{B}}_{\text{3}}}{{\text{N}}_3}{{\text{H}}_{\text{6}}}$ is a borane adduct. ${{\text{B}}_{\text{3}}}{{\text{N}}_3}{{\text{H}}_{\text{6}}}$ is known as borazine. This reaction takes place at an elevated temperature ${180^ \circ } - {190^ \circ }{\text{C}}$.
So, the correct answer is Option B.
Additional Information:
The cleavage of diborane does not form boron trihydride.
Diborane on burning in air gives ${{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}}$. The reaction is as follows:${{\text{B}}_{\text{2}}}{{\text{O}}_{\text{6}}} + 3{{\text{O}}_2} \to {{\text{B}}_{\text{2}}}{{\text{O}}_{\text{3}}} + 3{{\text{H}}_2}{\text{O}}$.
Common properties of diborane are:
Diborane is colorless.
At room temperature, diborane is highly flammable. It is generally flammable in air.
It is a sweet smelling gas.
It hydrolyses in water and produces boric acid and hydrogen gas.
Note:
Examples of Lewis bases are:
1.Lone pair donors: ${\text{N}}{{\text{H}}_{\text{3}}}{\text{,}}\,{{\text{H}}_{\text{2}}}{\text{O, O}}{{\text{H}}^ - },{\text{ CH}}_3^ - $.
2.Simple anions: ${{\text{H}}^ - },{\text{ }}{{\text{F}}^ - }$.
3.Complex anions: ${\text{SO}}_4^{2 - },{\text{ PO}}_4^{3 - }$.
$\pi $-systems rich in electron: ethyne, benzene.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Difference Between Plant Cell and Animal Cell
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Is the correct possessive form of Boss Bosss or Boss class 7 english CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you graph the function fx 4x class 9 maths CBSE