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  4. 2 - pentanone and 3 - pentanone can be distinguished by :

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Q. $ 2 $ - pentanone and $ 3 $ - pentanone can be distinguished by :

UPSEEUPSEE 2006

Solution:

$ 2$-pentanone and $3$-pentanone can be distinguished by iodoform test.
$CH_3 COCH _2CH_2 CH_3$ ($2$-pentanone) gives positive iodoform test while $CH_3 CH_2 COCH_2 CH_3$ ($3$-pentanone) does not give iodoform test.