Question

question 19 0.5 pts which of the following carbonyls have a stretching frequency around 1715 cm⁻¹? caution: more than one answer is possible. none of these

Explanation:

Step1: Recall carbonyl stretching frequencies

Aldehydes (first - structure) have carbon - oxygen double - bond stretching frequencies around 1720 - 1740 cm⁻¹. Acid chlorides (second - structure) have carbon - oxygen double - bond stretching frequencies around 1770 - 1815 cm⁻¹. Ketones (fourth - structure) have carbon - oxygen double - bond stretching frequencies around 1715 - 1720 cm⁻¹ for simple aliphatic ketones.

Answer:

The fourth structure (ketone)