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Question

Which of the following statements is correct about borazine?

A
Borazine is called 'inorganic benzene'
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B
Diborane react with ammonia to give borazine
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C
Like organic benzene, borazine does not give addition product.
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D
Borazine is more reactive than Benzene
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Solution

The correct option is D Borazine is more reactive than Benzene
Borazine is isostructural with benzene. The six B-N bonds have length of 1.436A. The carbon-carbon bond in benzene is shorter length at 1.397A. The boron-nitrogen bond length is between that of the boron-nitrogen single bond with 0.151 nm and the boron-nitrogen double bond which is 0.131 nm. This suggests partial delocalisation of nitrogen lone-pair electrons.
Borazine satisfies the (4n + 2) Huckel's rule and each B and N atom is sp2 hybridised. Hence, borazine is a inorganic benzene.

Benzene doesnot undergo addition reaction but borazine undergo addition reaction and it is more reactive than benzene molecule.
When diborane react with ammonia at ratio of 1:2, produce borazine and hydrogen.
3B2H6+6NH36BH3.NH32B3N3H6+12H2 Inorganic benzene
This reaction takes place at a temperature of 180190oC.
Thus, the correct statements are (a), (b) and (d).

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