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Distinction between pairs of compounds ...

Distinction between pairs of compounds
Acetaldehyde `(CH_(3)CHO)` and benzaldehyde `(C_(6)H_(5)CHO)`.

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(a) Acetaldehyde gives yellow ppt. of iodoform `(CHI_(3))` with `I_(2)//NaOH` or NaOI while benzaldehyde does not.
`CH_(3)CHO+3NaOIrarrCHI_(3)darr+HCOONa+2NaOH`
(b) Acetaldehyde reduces Fehling solution to red ppt. of `Cu_(2)O` while benzaldehyde does not.
`CH_(3)CHO+underset("From Fehling solution")(ubrace(2Cu^(2+)+5OH^(-)))rarrCu_(2)O^(-)+CH_(3)COO^(-)+3H_(2)O`
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