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a
Acetaldehyde undergoes condensation in presence of dilute alkali
b
Acetone gives positive 2,4-DNP test
c
Formaldehyde cannot undergo disproportionation in presence of conc.alkali
d
Benzaldehyde gives positive Tollen's test
answer is C.
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Detailed Solution
Aldehydes not containing α-hydrogen atoms undergo disproportionation in presence of conc.alkali;The reaction is called Cannizaro's reaction;2HCHO→conc.KOHHCOO-K++CH3OH