Esters contain two C–O bonds and therefore will produce two separate stretching signals in the fingerprint region of an IR spectrum. One of these signals typically appears at approximately 1000 cm^-1, while the other appears at approximately 1300 cm^-1. Predict which of the two C–O bonds produces the higher energy signal. Using principles that we learned in this chapter (factors that affect the wave number of absorption), offer two separate explanations for your choice.