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Great! You've got the correct answer!

The isomer
D) Isomer D
is identical to the di-ketene in question.
and hopefully, these are the reasons that made you decide this way:
  • D) gives rise to two NMR signals from the protons in the CH2= and >CH2 groups.
  • The ratio of the intensities is 1 : 1, since both of the two groups contain two equivalent protons.
Now continue to page 70 for a short summary and the conclusion of this section!