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Question

In the reaction, 2X+B2H6[BH2(X)2]+BH4, the amine(s) X is (are) :

A
NH3
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B
CH3NH2
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C
(CH3)2NH
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D
(CH3)3N
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Solution

The correct options are
A NH3
B CH3NH2
C (CH3)2NH
Smaller amines such as NH3, CH3NH2 and (CH3)2NH give unsymetrical cleavage of diborane according to following reaction
2NH3+B2H6[BH2(NH3)2]+BH4
Large amines such as (CH3)3N give symmetrical cleavage of diborane according to following reaction
B2H6+2N(CH3)32(CH3)3NBH3

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