In the reaction 2X + B2H6 → [BH2(X)2] + [BH4]⁻, the amine(s) X is(are): NH3, (CH3)2NH, (CH3)3N, CH3NH2

Amines add to diborane to form addition compounds which contain a complex ion. In the reaction, 2X + B2H6 → [BH2(X)2] + [BH4]⁻, the amines (X) that can be used are NH3, CH3NH2, and (CH3)2NH. Trimethylamine cannot be used as it is bulky. Options A, C, and D are correct.