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Answers:

Isomer D) is the diketene, since the ratio of the intensities in the NMR spectrum is 1:1, while the ratio for isomer C) would be 3:1.

If you reached the wrong conclusion, check on page 53

Now try another, similar problem:

A substance with the composition C3H5O2Br shows in its 1H-NMR spectrum 3 signals with a ratio of their intensities of 3:l:1.
Which of the following structures are in agreement with such a spectrum?

A)

B)

C)
isomer A isomer B isomer C

Check your solutions here!