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Doublet of Quartets NMR

ORGO1-CBGNA4

A doublet of quartets is observed in the $_{ }^{ 1 }{ H }$ NMR spectrum of an unknown compound at a chemical shift of 1.5ppm.

How many different, chemically distinct, types of protons are coupled to the proton which generated this signal?

A

1

B

2

C

4

D

8