Which one of the following methyl diboranes does not exist?

B_{2} H_{4} (C H_{3})_{2}

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B_{2} H_{3} (C H_{3})_{3}

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B_{2} H_{2} (C H_{3})_{4}

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B_{2} H (C H_{3})_{5}

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Solution

The correct option is B $B_{2} H (C H_{3})_{5}$
Di borane forms methyl diborane( $B_{2} H_{5} (C H_{3}))$ ,dimethyl diborane( $B_{2} H_{4} (C H_{3})_{2}$ ),trimethyl diborane( $B_{2} H_{3} (C H_{3})_{3}$ ) ,tetramethyl diborane( $B_{2} H_{2} (C H_{3})_{4}$ ).
So $B_{2} H (C H_{3})_{5}$ can not form,becuase in this compound we have to use bridge hydrogen for the formation of this compound,that never happens.
Hence option D is correct.

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