For the following pair of compounds the expected stretching absorption of the C=O bond is 1685 cm-1 and 1655 cm-1 respectively. Explain using both words and structural drawings. 
Definitions:
Progressive Muscle Relaxation
A relaxation technique involving tensing and then slowly relaxing each muscle group, to reduce stress and anxiety.
Highly Stressful
Pertaining to situations or conditions that cause a high level of stress or tension.
Post-Traumatic Stress Disorder
A mental health condition triggered by experiencing or witnessing a terrifying event, characterized by flashbacks, nightmares, and severe anxiety.
Sexual Assault
An act in which a person intentionally sexually touches another person without that person's consent, or coerces or physically forces a person to engage in a sexual act against their will.
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