First slide

Diborane

Question

Diborane does not liberate H₂ gas with

Easy

A

H₂O
B

KOH
C

NH₃ at 120°C
D

NH₃ at 200°C

Solution

${B_2}{H_6} + 6{H_2}O \to 2{H_3}B{O_3} + 6{H_2} \uparrow$
${B_2}{H_6} + 2{H_2}O + \,\,2KOH \to \mathop {2KB{O_2}}\limits_{Potassium\,\,metaborate} + 6{H_2} \uparrow$
Case-I
$3{B_2}{H_6} + \mathop {6N{H_3}}\limits_{Excess} \xrightarrow{{Low\,temperature; < {{200}^0}c}}\mathop {\mathop {3{{[{H_3}N \to B{H_2} \leftarrow N{H_3}]}^ + }{{[B{H_4}]}^ - }}\limits_{OR} }\limits_{3[{B_2}{H_6}.2N{H_3}]}$
$\mathop {\mathop {3{{[{H_3}N \to B{H_2} \leftarrow N{H_3}]}^ + }{{[B{H_4}]}^ - }}\limits_{OR} }\limits_{3[{B_2}{H_6}.2N{H_3}]} \xrightarrow{{High\,\,temperature; > {{200}^0}c}}\,2{B_3}{N_3}{H_6} + 12{H_2}$
Case-II
${B_2}{H_6} + \mathop {N{H_3}}\limits_{Excess} \xrightarrow{{Very\,\,high\,\,temperature}}3{[BN]_n} + {H_2} \uparrow$
Case-III
$\mathop {3{B_2}{H_6}\; + \;6N{H_3}}\limits_{1\;\;\;\;\;\;\;:\;\;\;\;\;\;\;\;2}\xrightarrow{{\,\,high\,\,temperature;\, > {{200}^0}c}}2{B_3}{N_3}{H_6} + 12{H_2} \uparrow$

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