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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ie037

Which of the following reactions are Lewis acid-base reactions that are NOT Bronsted-Lowry acid-base (proton transfer) reactions?

A $BF X_{3} + NH X_{3} F X_{3} B - NH X_{3}$
B $Ag X^{+} + 2 CN X^{-} [Ag (CN) X_{2}] X^{-}$
C $HCl + NH X_{3} NH X_{4} X^{+} + Cl X^{-}$
D $CO X_{2} + OH X^{-} HCO X_{3} X^{-}$

Answer: A, B, D

Options 1, 2 and 4 involve donation of an electron pair to an acceptor (

BF X_{3}

,

Ag X^{+}

,

CO X_{2}

) with no proton being transferred from an acid to a base. Option 3 transfers

H X^{+}

from

HCl

to

NH X_{3}

, so it is Bronsted-Lowry (and also Lewis).

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