Which test is useful to distinguish between 2-pentanone and 3-pentanone?

Explanation

Since 2-pentanone contains methyl ketone `(CH_(3)-overset(O)overset(||)C-)`
it undergoes iodoform test with an alkaline solution of iodine and forms yellow precipitate of iodoform But-3-pentanone does not give this test.
`underset("2 - pentanone")(CH_(3)-CH_(2)-CH_(2)-overset(O)overset(||)C-CH_(3))+4NaOH +3I_(2)rarr CH_(3)CH_(2)-CH_(2)-overset(O)overset(||)C-ON a +underset("(yellow precipiate)")underset("Iodoform")(CHI_(3)+3H_(2)O+3NaI)`