CH₃CH₂OH can be converted into CH₃CHO by ________________ .

I. Catalytic hydrogenation

II. Treatment with LiA1H₄

III. Treatment with pyridinium chlorochromate

IV. Treatment with KMnO₄

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p> (III) Treatment with pyridinium chlorochromate&nbsp;</p><p>The pyridinium chlorochromate is a complex of chromium trioxide with pyridine. This reagent is preferred for mild oxidation to form aldehydes and hence the oxidation to carboxylic acid is prevented.</p><p>Primary alcohols are oxidized to form aldehyde, whereas secondary and tertiary alcohols are oxidized to form ketones. The conversion of a hydroxyl group to aldehyde can be done by the removal of hydrogen atoms (Oxidation), looking at the following options; pyridinium chlorochromate and potassium dichromate are both oxidizing agents. However, when pyridinium chlorochromate is used, it is a weaker oxidizing agent compared to potassium permanganate; hence, it reduces ethanol to acetaldehyde (ethanal).</p><p>CH₃CH₂OH&nbsp; <img src="https://images.shiksha.com/mediadata/images/articles/1746523057phpwRITFu.jpeg" alt="" width="36" height="44"> CH₃CHO</p>

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