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Question

Diborane undergoes cleavage and gives adduct with:
(i) CO
(ii) H2O
(iii) NMe3
(iv) NH3

A
i,iii
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B
ii,iii
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C
i,iv
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D
i,ii
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Solution

The correct option is A i,iii
(i) and (iii): Diborane undergoes cleavage reactions with Lewis bases (L) to give borane adducts, BH3.L
B2H6+2NMe32BH3NMe3
B2H6+2CO2BH3CO
(ii) diborane gets hydrolysed readily to give boric acid.
B2H6Borane+6H2O2H3BO3Orthoboric acid+6H2Dihydrogen
(iv) Diammoniate salt complex is formed
B2H6+NH3(excess)low temperature−−−−−−−−B2H6.2NH3 or [H2B(NH3)2]+[BH4]
Hence correct option is b.

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