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To distinguish between 2-pentanone and 3-pentanone which reagent can be used ?

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To distinguish between 2-pentanone and 3-pentanone which reagent can be used ?
A. `K_(2)Cr_(2)O_(7)//H_(2)SO_(4)`
B. Zn-Hg/HCl
C. `SeO_(2)`
D. iodine /NaOH
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Correct Answer - D
Due to the presence of active keto methyl group, 2-pentanone will respond to idodform test, but pentan-3-one does not.
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