Diborane (B_{2}H_{6}) reacts independenttly with O_{2}  and H_{2}O to produce, respectively:

 

  • Option 1)

    H_{3}BO_{3}\; and\; B_{2}O_{3}

  • Option 2)

    B_{2}O_{3}\; and\; [BH_{4}]^{-}

  • Option 3)

    B_{2}O_{3}\; and\;H_{3}BO_{3}

     

  • Option 4)

    HBO_{2}\; and\;H_{3}BO_{3}

Answers (1)

 

 

Diborane -

Simplest boron hydride, dimer of BH3, colourless and highly toxic gas

- wherein

Hybridisation of boron in diborane is sp3

 

 

 

Preparation of diborane in laboratory -

By the oxidation of sodium borohydride with I2

- wherein

2NaBH_{4}+I_{2}\overset{Polyether}{\rightarrow}B_{2}H_{6}+2NaI+H_{2}

 

 

 

Preparation of diborane from boron halides -

8BF_{3}+6LiH\overset{450K}{\rightarrow}B_{2}H_{6}+6LiBF_{4}

4BCl_{3}+LiAlH_{4}\rightarrow 2B_{2}H_{6}+3AlCl_{3}+3LiCl

-

 

 

 

Oxides of boron family -

Acidity decreases and basicity increases down the group

General formula: M2O3

- wherein

Aluminium oxide is amphoteric

 

 

 

 

 

 

B_{2}H_{6}+3H_{2}O\rightarrow 2H_{3}BO_{3}+3H_{2}

B_{2}H_{6}+3O_{2}\rightarrow B_{2}O_{3}+3H_{2}O


Option 1)

H_{3}BO_{3}\; and\; B_{2}O_{3}

Option 2)

B_{2}O_{3}\; and\; [BH_{4}]^{-}

Option 3)

B_{2}O_{3}\; and\;H_{3}BO_{3}

 

Option 4)

HBO_{2}\; and\;H_{3}BO_{3}

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