Answer:
The other signal that would indicate the presence of a C= C bond appears close to 3100 [tex]cm^{-1}[/tex].
Explanation:
Bands that appear above 3000 [tex]cm^{-1}[/tex] are often unsaturation diagnoses suggest. The band at 3000- 3100 [tex]cm^{-1}[/tex] is characteristics for C-H stretching frequencies and normally is overlaps with the ones for alkanes because it is a band of weak intensity.