Question

Determine the unknown of these NMR graphs using table below, table below is just an example, follow table to demonstrate what unknow is

	Chemical Shift	Integration	Splitting	# of Neighbors	Frequent.
a	0.9	3H	TRIPLET	2	CH3-CH2-
b	1.5	2h	SEXTET	5	CH3
c	3.6	2H	TRIPLET	2
d	3.8	1H	SINGLET	0

314 3H 1 X 2.0 4.0 3.0 5.0 6.0 ppm (t1) Unknown 41 CsH&O2 6.081 6.078 6.076 6.073 6.545 93 5.540 5.535 5.529 5.524 1.926 1.922 1.921 1.917
  

Answer 1

$CH3OCH=CHCOCH3$

SlNo	Chemical Shift	Integration	Splitting	# no of neighbours	Frequent
a	1.0	3H	Singlet	0	COCH3
b	3.7	3H	Singlet	0	OCH3
c	5.5	1H	Singlet	0	Alkenes (splitting can occur based on E or Z isomer
d	6.1	1H	Singlet	0	Alkenes

Based on the splitting pattern at 5.5 and 6.1 this molecule should exist and E isomer. A doublet is expected at this region of 5.5 and 6.1 if this is existing as Z isomer.