Concept:Controlled oxidation increases the number of carbon-oxygen bonds while decreasing carbon-hydrogen bonds.
Formula:$$ \text{R-CH}_2\text{OH} \xrightarrow{[O]} \text{RCHO (Aldehyde)} $$
$$ \text{R}_2\text{CHOH} \xrightarrow{[O]} \text{R}_2\text{CO (Ketone)} $$
Solution:- Oxidizing a primary alcohol yields an aldehyde.
- Oxidizing a secondary alcohol yields a ketone.
- Therefore, the general functional groups resulting from the first step of alcohol oxidation are ketones and aldehydes.
Why other options are incorrect:Alkanes represent a fully reduced state, not an oxidized state. While aldehydes can be further oxidized to acids, the immediate parallel functional group pair corresponding directly to the basic oxidation of 1° and 2° alcohols is aldehyde/ketone.
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