Which of the following vibrations can be used to distinguish CH 2 =CH-CH=CH 2 and CH 3 CH=CHCOCH 3 ?
A.
The stretching vibrations of = C - H at about 31 00- 3000 cm -1
B.
The stretching vibrations of - C - H at about 30 00 -2800 cm -1
C.
The stretching vibrations of - C =C- at about 165 0 cm -1
D.
The stretching vibrations of - C =O at about 1700 cm -1