Answer the following questions about an unknown organic compound with formula C_
ID: 522467 • Letter: A
Question
Answer the following questions about an unknown organic compound with formula C_5H_10O. What is the index of hydrogen deficiency (IHD) for the compound? On the bottom of the page is the IR spectrum for this unknown compound. What absorptions are responsible for the sets of peaks at 2900 cm^-1 and at 1715 cm^-1? The 1-H NMR spectrum for this compound shows only 2 sets of peaks: a quartet (4 peaks) at 2.2 ppm and a triplet (3 peaks) at 1.5 ppm. From the list of compounds below, which compound would be the correct structure for this unknown? A) CH_3 CH_2 O CH = CH CH_3 B) CH_3 CH_2 CH_2 CH_2 -H C) CH_3 CH_2 CH_2 - CH_3 D) CH_3 CH_2 CH_2 CH_3Explanation / Answer
As per the above IR spectrum the compound is 2-pentanone ie CH3-CH2-CH2-C=OCH3
1715 is for C=O group
1100 is for CH3 group
3000 is for alkyl group
2900 is also for alkyl group.
So accordingly the compound is derived.