Which compound matches the ir spectrum best?

Which compound matches the IR spectrum best? A B

???

Answer

D is the compound.

note:

1710 cm-1 is C=O for ketone. Thus, it may be D, E, F.

E should have peak of N-H in the range of > 3000 cm-1. F should have C=C-H absorptions at > 3000 cm-1. however, there has no any peak at > 3000 cm-1. Thus, E and F can be ruled out. Answer is then D.

B

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