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How many of the following will give 2,4-DNP test.
`1.CH_(3)CH=O " " (2) CH_(3)-overset(O)overset(||)(C)-CH_3 " " (3) Ph-CH=O " " (4) Ph-overset(O)overset(||)(C)-CH_(3)`
Glucose (Aldose) (6) Fructose (Ketose) (7) HCOOH (8) Ph-NH-OH

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