First slide
13th group or boron group

Which one of the following methyl diboranes does not exist?


Di borane forms methyl diborane(B2​H5​(CH3​)),dimethyl diborane(B2​H4​(CH3​)2​),trimethyl diborane(B2H3​(CH3​)3​) ,tetra methyl diborane(B2H2​(CH3)4​).
So B2H(CH3​)5​ can not form, because  in this compound we have to use bridge hydrogen for the formation of this compound ,that never happens.

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