Assertion: Both reactions are Lewis acid-base reactions?
i. $N H_{3} + B F_{3} ⟶ H_{3} N - B F_{3}$
ii. $M g + S ⟶ M g^{2 +} + S^{2 -}$
Reason: Lewis acid-base reaction involve the donation of lone pair electrons from base to acid. This donation results in a coordinate bond.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is E Assertion is incorrect but Reason is correct

According to Lewis concept of acids and bases, an acid is a substance which can accept a lone pair of electrons whereas a base is a substance which can donate a lone pair of electrons.
Lewis acid-base reaction involves the donation of lone pair electrons from base to acid. This donation results in a coordinate bond.

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Assertion: Both reactions are Lewis acid-base reactions?i. NH3+BF3⟶H3N−BF3ii. Mg+S⟶Mg2++S2− Reason: Lewis acid-base reaction involve the donation of lone pair electrons from base to acid. This donation results in a coordinate bond.

Assertion: Both reactions are Lewis acid-base reactions?
i. $N H_{3} + B F_{3} ⟶ H_{3} N - B F_{3}$
ii. $M g + S ⟶ M g^{2 +} + S^{2 -}$
Reason: Lewis acid-base reaction involve the donation of lone pair electrons from base to acid. This donation results in a coordinate bond.