In the reaction, 2X+B2H6→[BH2(X)2]+BH−4, 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 ANH3 BCH3NH2 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]+BH−4 Large amines such as (CH3)3N give symmetrical cleavage of diborane according to following reaction B2H6+2N(CH3)3→2(CH3)3N→BH3