Formaldehyde can be distinguished from acetaldehyde by use of
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React with NaOH and I. acetaldehyde will form iodoform while formaldehyde will not form.
HCHO+4NaOH+3I2-----------> no iodoform
CH3CHO +4NaOH+3I2------->CHI3+3H20+3NaI
HCHO+4NaOH+3I2-----------> no iodoform
CH3CHO +4NaOH+3I2------->CHI3+3H20+3NaI
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