> Is Wolfram Alpha case sencitive?

Yes.

> If yes, try KCn instead.

That's not the correct formula though. The corrent formula is KCN. (K 
for potassium, C for carbon, N for nitrogen.) Cn is the symbol for 
copernicium (a rare radioactive element).

> Alternatively, you ask using the full name: "potassium cyanide". Don't
> forget the quotes.

Yeah, potassium cyanide works. It's just a lot more typing...

Weirdly, HCN for hydrogen cyanide works perfectly OK.

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