# Finding chiral carbons in aromatic or cyclic compounds

I know that for a carbon to be chiral four different groups should be attached to that particular carbon. But, what about in the case of cyclic compounds? What's the method to check chirality if the carbon is not $\mathrm{sp}^3$ hybridized and only three, or two groups are attached to it (through double or triple bonds)?

• @K_P That's true, good point. But still their ($\ce{sp^{2}}$ carbon) atoms are no stereogenic centers. – Philipp Oct 29 '14 at 9:27