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a
Formaldehyde is soluble in water
b
Acetic acid exists as dimer in benzene
c
Acetone is a pleasant smelling liquid
d
Acetaldehyde is insoluble in water
answer is D.
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Detailed Solution
HCHO, CH3CHO, CH3COCH3 are soluble in waterLower aldehydes & Ketones are soluble in water due to Polar nature.Ketones are pleasant smellingLower aldehydes are pungent smelling but as molecular weight increases their odour becomes pleasant.