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Orthoboric Acid

Assertion :Th...

Question

Assertion :The acidic strength sequence $B M e_{3} < B (M e O)_{3}$ Reason: The acidic strength can also be explained by considering the existing back bonding.

A

Assertion is true, Reason is true and Reason is correct explanation for Assertion.

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B

Assertion is true, Reason is true and Reason is not the correct explanation for Assertion

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C

Assertion is true, Reason is false.

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D

Assertion is false, Reason is true.

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Solution

The correct option is D
Assertion is false, Reason is true.

In both the compounds, Boron forms $3$ covalent bonds with the three methyl groups in trimethylborane and trimethoxyborane.

Boron has $3$ valence electrons of its own and gains $3$ more electrons in the covalent bond. Hence, it has a total of $6$ electrons.

The octet is not complete and boron is electron deficient. It thus, acts as lewis acid.

Trimethyl borane is more acidic than trimethoxy borane due to involvement of back-bonding of boron with oxygen which somehow, suppresses the electron deficiency of boron. Thus, assertion is false and reason is true.

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