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Aldehydes, Ketones, and Carboxylic Acids — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryAldehydes, Ketones, and Carboxylic Acids1 Mark
Question
Write a test to differentiate between pentan-2-one and pentan-3-one.
✓

Answer

Pentan-2-one having a $\ \ \ \ \ \ \ \ \ \text{O}\\\ \ \ \ \ \ \ \ \ ||\\ \ \ \ \ -\text{C}-\text{CH}_3$ group form a yellow ppt of iodoform with an alkaline solution of iodine (i.e. iodoform test) while pentan-3-one does not.
$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \text{O}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ||\\\text{CH}_3\text{CH}_2\text{CH}_2-\text{C}-\text{CH}_3\xrightarrow[\text{(Iodoform test)}]{\text{I}_2/\text{NaOH}}\text{CHI}_3+\text{CH}_3\text{CH}_2\text{CH}_2\text{COONa}\\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{pentan-2-one}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{yellow ppt.}\ \ \ \ \ \ \ \ \ \ ^\text{sodium butanoate}$

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