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Tuesday, January 5, 2021

What is/are correct statement about Boroxine ion (B3O6-3) and Borazole (Inorganic Benzene)/ B3N3H6?

 (A) Both are planer and non polar

(B) Both have aromatic character

(C) Both have ppi-ppi bond formed by pairing of unpaired electrons

(D) Electrophilic subtitution  reaction occurs at B3N3H6

SOLUTION:( A,B,D) In Boraxine ion boron and oxygen atom alternatively combined to form six member ring and also each boron atom linked with extra oxygen atoms. Both boron and oxygen atoms have sp2 hybridization (by Back bonding and all oxygen atom involved in back bonding) and planer structure due to fact ring become aromatic but due to sp3 hybrisation of oxygen atom molecule become polar.

In Borazine (Inorganic Benzene) molecule, nitrogen is more electro negative than the boron. Nitrogen acquires partial negative charge and boron acquires partial positive charge and back bonding take place between boron and nitrogen.

Even though Borazine and Benzene have same stricture their chemical properties are different.

(1) Organic benzene is C6H6 while Inorganic benzene is Borazine having chemical formula B3N3H6

(2) Borazine is more reactive than Benzene with repect to electrophic addition reactions  due to high polarity (B-N polar bond) of Borazine plecules.

(3) Aromaticity of borazine is less than benzene  hence it is less reactive  toward Eectrophilic  substitution reactions than Benzene. 

Hence options (A), (B) and (D) is correct  But Option (C) is Incorrect Both have  pi-bond due to back bonding not due to formed by pairing of unpaired electrons

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