Assertion (A): Both reactions are Lewis acid-base recations?
i. `NH_(3) + BF_(3) rarr H_(3)N: BF_(3)`
ii. `Mg +S rarr Mg^(2+) +S^(2-)`
Reason (R) : Lewis acid-base reaction involve the donation of lone pair electrons from base to acid. this donation results in a corrdinate bond.

Options

A. If both (A) and (R) are correc, and (R) is the correct explanation of (A).
B. If both (A) and (R) are correct but (R) is not the correct explanation of (A).
C. If (A) is correct, but (R) is incorrect.
D. If (A) is incorrect, but (R) is correct.

Answer

D

Explanation

`(A)` only reaction (i) is Lewis acid-base reaction. Hence `(A)` is wrong.
`(R)` is correct.