Question

question
which of the following molecules is not an aldehyde?
select all that apply:
□ (ch₃)₃coh
□ ch₃ch₂cho
□ ch₃coch₃
□ hcho

Explanation:

Step1: Recall the structure of aldehyde

An aldehyde has the general formula \(R - \text{CHO}\), where \(R\) can be \(H\) or an alkyl group.

Step2: Analyze each molecule

• For \((\text{CH}_3)_3\text{COH}\): It has a \(-\text{OH}\) group (hydroxyl group), so it is an alcohol (specifically a tertiary alcohol), not an aldehyde.
• For \(\text{CH}_3\text{CH}_2\text{CHO}\): It has the \(-\text{CHO}\) group (\(R=\text{CH}_3\text{CH}_2-\)), so it is an aldehyde (propanal).
• For \(\text{CH}_3\text{COCH}_3\): It has a \(-\text{CO}-\) group (carbonyl group between two alkyl groups), so it is a ketone (propanone), not an aldehyde.
• For \(\text{HCHO}\): It has the \(-\text{CHO}\) group (\(R = H\)), so it is an aldehyde (methanal).

Answer:

A. \((\text{CH}_3)_3\text{COH}\), C. \(\text{CH}_3\text{COCH}_3\)