Assertion :According to Bronsted Lowry theory $B F_{3}$ is an acid. Reason: $B F_{3}$ is an electron deficient compound.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is D Assertion is incorrect but Reason is correct
Bronsted acid which donates a proton.
$B F_{3}$ doesn't have a proton to donate.
$B F_{3}$ is an electrophile and accepts lone pair of electron so it is lewis acid.

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Choose the correct option.

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