what is the stretching frequency (in cm⁻¹) of the following carbonyl?\n1765\n1715\n1775 and 1810\n1685
what is the stretching frequency (in cm⁻¹) of the following carbonyl?\n1765\n1715\n1775 and 1810\n1685
Answer
Explanation:
Step1: Identify the carbonyl type
The given compound is an ester - like carbonyl. Esters generally have carbonyl stretching frequencies in the range of 1735 - 1750 (cm^{-1}) for aliphatic esters. However, the presence of the adjacent carbonyl and the ring structure can cause some shifts.
Step2: Analyze the options
1765 (cm^{-1}) is in the general range for carbonyl stretching of esters with some possible electronic - effects from the adjacent groups. 1715 (cm^{-1}) is more typical for ketones or aldehydes in some cases and not for this ester - like carbonyl. The range 1775 - 1810 (cm^{-1}) is too high for this type of carbonyl, usually associated with highly conjugated or strained carbonyls like acid anhydrides. 1685 (cm^{-1}) is too low and is more characteristic of conjugated carbonyls like in amides or some enones.
Answer:
1765