Lewis but not Bronsted-Lowry acid-base reaction

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Homework Statement


Screen Shot 2016-07-05 at 5.04.25 PM.png


Homework Equations

The Attempt at a Solution


A lewis acid donates a electron pair while a bronsted-lowry acid accepts a proton. So I need to cancel out all the ones that has proton exchanges. They are B, C, D and E. However, in A, it isn't really an acid base reaction but a solubility equation.

In B the cyanide ion accepts a proton.
In C the ammonia accepts a proton.
In D the water accepts a proton
In E the hydroxide accepts a proton.

Clearly, one of these isn't true so where was my thinking wrong?

Cheers!
 

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