Which of the following equilibria represents | vedclass

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(D) $Lewis$ acid-base reaction involves the donation of a lone pair of electrons from a $Lewis$ base to a $Lewis$ acid to form a coordinate covalent b

Vedclass · Accepted Answer

$Cu^{2+} + 4NH_3 \rightleftharpoons [Cu(NH_3)_4]^{2+}$

Vedclass · Answer

(D) $Lewis$ acid-base reaction involves the donation of a lone pair of electrons from a $Lewis$ base to a $Lewis$ acid to form a coordinate covalent bond.In the reaction $Cu^{2+} + 4NH_3 \rightleftharpoons [Cu(NH_3)_4]^{2+}$,the $Cu^{2+}$ ion acts as a $Lewis$ acid (electron pair acceptor) and $NH_3$ acts as a $Lewis$ base (electron pair donor).This reaction does not involve the transfer of a proton $(H^+)$,which is the defining characteristic of a $Br\o nsted$ acid-base reaction. Therefore,it is a $Lewis$ acid-base reaction but not a $Br\o nsted$ acid-base reaction.

Acid	$K_a$
$HCN$	$6.2 \times 10^{-10}$
$HF$	$7.2 \times 10^{-4}$
$HNO_2$	$4.0 \times 10^{-4}$

Which of the following equilibria represents a $Lewis$ acid-base reaction but not a $Br\o nsted$ acid-base reaction?

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In the reaction $HCl + H_2O \rightleftharpoons H_3O^{+} + Cl^{-}$,which of the following statements is correct?

Values of dissociation constant,$K_a$ are given as follows:
Acid $K_a$
$HCN$ $6.2 \times 10^{-10}$
$HF$ $7.2 \times 10^{-4}$
$HNO_2$ $4.0 \times 10^{-4}$

Correct order of increasing base strength of the bases $CN^{-}$,$F^{-}$ and $NO_2^-$ will be:

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