For compound J, the mass spectrum shows that the peak-height ratio of the M + 1 ion to the M + ion is $4:91$. When compound J is heated with acidified $\text{K}_2\text{Cr}_2\text{O}_7$, it produces a carboxylic acid. What is compound J?
- Abutanal
- Bbutanone
- Cpropan-1-ol
- Dpropanenitrile