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Chemistry · 2025 · 2 marks
Aldehydes, Ketones and Carboxylic AcidsChemical Reactions of Aldehydes, Ketones and Carboxylic Acids2 marksApplyvery short answer
CBSE 2025 · Region 5 · Set 2 · Q21
(a) Give a simple chemical test to distinguish between 3-pentanone and 2-pentanone. (b) Write an equation for Clemmensen reduction.
(a)
Give a simple chemical test to distinguish between $\displaystyle 3$-pentanone and $\displaystyle 2$-pentanone.
(b)
Write an equation for Clemmensen reduction.
Marking-scheme solution
(a)
Add NaOH and iodine to both the compounds and heat, $\displaystyle 2$-Pentanone gives yellow ppt of
iodoform (CHI3) whereas $\displaystyle 3$-Pentanone does not.
(b)
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.