Identify the compounds which give yellow precipitate with $I_{2} + N a O H$
(a) Ethyl alcohol (b) Acetone
(c) Propyl alcohol (d) 2-propanol
(e) 3- butanone (f) Butanal

c, e and f

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a, d and f

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e, f and a

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a, b and d

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Solution

The correct option is C a, b and d
The reaction of iodine and base with methyl ketones gives the appearance of a yellow precipitate, is used to probe the presence of a methyl ketone. This is also the case when testing for secondary alcohols (methyl alcohols. Ethyl alcohol, Acetone and 2-propanol gives positive test.

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Identify the compounds which give yellow precipitate with I2+NaOH(a) Ethyl alcohol (b) Acetone(c) Propyl alcohol (d) 2-propanol(e) 3- butanone (f) Butanal

Identify the compounds which give yellow precipitate with $I_{2} + N a O H$
(a) Ethyl alcohol (b) Acetone
(c) Propyl alcohol (d) 2-propanol
(e) 3- butanone (f) Butanal