Question

I am really having a hard time with this question.

Which of these compounds will exhibit optical isomerism? Show why.


a) CH3CH2CONHC2H5

b) CH3-CH-NO2 CH2-COOH

i don't even know where to begin.
Look at carbon #2 from the left. Doesn't that carbon have four separate groups attached?
I didn't say which one did I? I meant #2 carbon of answer 2.

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