From the given molecular formula, IR, and NMR, circle the one correct answer for each question found below:
Unknown C has molecular formula $C_{10}H_{12}O_2$
IR for Unknown C (important peaks marked)
$^1$H NMR for Unknown C
1) The unsaturation index for Unknown C is:
A) 1
B) 3
C) 4
D) 5
E) 10
2) The functional group found in Unknown C is:
A) an ester
B) a carboxylic acid
C) an aldehyde
D) an alcohol
E) a ketone
3) The chemical structure for Unknown C is (circle the correct one):
(Five possible structures are given)
8.1 ppm
a = 2 H,
doublet
7.3 ppm
b, c = 3 H,
multiplet
4.3 ppm
d = 2 H,
triplet
1.0 ppm
f = 3 H,
triplet
1.8 ppm
e = 2 H,
sextet
