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Q.

Which one of the following methyl diboranes does not exist?

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a

$B_{2} H_{4} {({CH}_{3})}_{2}$

b

$B_{2} H_{3} {({CH}_{3})}_{3}$

c

$B_{2} H_{2} {({CH}_{3})}_{4}$

d

$B_{2} H {({CH}_{3})}_{5}$

answer is D.

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Detailed Solution

Di borane forms methyl diborane(B₂H₅(CH₃)),dimethyl diborane(B₂H₄(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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