Q.

Which one of the following methyl diboranes does not exist?

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a

B2H4CH32

b

B2H3CH33

c

B2H2CH34

d

B2HCH35

answer is D.

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Detailed Solution

Di borane forms methyl diborane(B2​H5​(CH3​)),dimethyl diborane(B2​H4​(CH3​)2​),trimethyl diborane(B2​H3​(CH3​)3​) ,tetra methyl diborane(B2​H2​(CH3​)4​).So B2​H(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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Which one of the following methyl diboranes does not exist?