Question

what is the stretching frequency (in cm^-1) of the following carbonyl?
1775
1815
1715

Explanation:

Step1: Identify the carbonyl type

The given carbonyl is a cyclobutanone. Ring - strain affects carbonyl stretching frequencies. Cyclic ketones with smaller rings have higher - frequency carbonyl stretches due to increased ring - strain.

Step2: Recall typical stretching frequencies

For cyclobutanone, the carbonyl stretching frequency is around 1775 cm⁻¹ due to the significant ring - strain in the four - membered ring.

Answer:

1775