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Stereoisomerism

Assertion : D...

Question

Assertion : Diborane has two types of hydrogens.

Reason : By methylation only four hydrogen atoms of diborane are substituted forming $M e_{4} B_{2} H_{2}$ .

A

Both Assertion and Reason are true and Reason is correct explanation of Assertion

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B

Both Assertion and Reason are true and Reason is not the correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Assertion is false but Reason is true

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Solution

The correct option is A Both Assertion and Reason are true and Reason is correct explanation of Assertion
Diborane has 4-termianl $B - H$ bonds and 2-bridged $B - H - B$ bonds. During methylation of diborane, all terminal $H$ atoms are replaced by methyl atoms.

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