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Sulphonation of Aromatics

Which one of ...

Question

Which one of the following will not form a yellow precipitate on heating with an alkaline solution of iodine?

A

C H_{3} C H (O H) C H_{3}

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B

C H_{3} C H_{2} C H (O H) C H_{3}

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C

C H_{3} O H

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D

C H_{3} C H_{2} O H

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Solution

The correct option is C $C H_{3} O H$
Formation of a yellow precipitate on heating a compound with an alkaline solution of iodine is known as iodoform reaction. Methyl alcohol does not respond to this test. Iodoform test is exhibited by ethyl alcohol, acetaldehyde, acetone, methyl ketones and those alcohols which possess $C H_{3} C H (O H) -$ group.

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