Question

If cyclohexanone is present, there will be a _______ for the _______ group in the IR Spectrum.

a. Peak; Carbonyl
b. Trough; Hydroxyl
c. Peak; Hydroxyl
d. Trough; Carbonyl

Answer 1

In IR Spectroscopy, cyclohexanone presents a strong, sharp absorption peak for the carbonyl group in the range of 1650-1750 cm-1, typically near 1716 cm-1.

Step-by-step explanation:

If cyclohexanone is present, the Infrared (IR) Spectroscopy will show a characteristic absorption peak for the carbonyl group. The peak in question is due to the carbonyl double bond, typically found in the range of 1650-1750 cm-1, with ketones such as cyclohexanone often absorbing near 1716 cm-1.

This absorption is manifested in the spectrum as a strong and sharp peak, as the double bond of the carbonyl group has a significant dipole moment that changes during vibration, making it highly detectable via IR spectroscopy.