Question of the Day

A compound of molecular formula C8H7ClO shows a prominent band in its IR spectrum at 1690 cm-1. 1H-NMR spectrum revealed only two major types of protons in the ratio of 5: 2. Which one of the following structures best fits the above data?
C8H7ClO IR data: 1690 cm–1 NMR data: two types of protons in 5: 2 ratio. Only two types of protons. Ketone with conjugation shows peaks at 1690 cm–1.
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