Answer:
Pentan-2-one
is a methyl ketone (i.e., contains the grouping 
) and hence undergoes lodoform
test on treatment with 
to give yellow
ppt. of iodoform. In contrast, pentan-3-one is not a methyl ketone and hence
does not give yellow ppt. of 
on
treatment with .
No
yellow ppt. of
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