Explain the conversion of phenol to benzene.

The iodoform test is a qualitative chemical test for identification of ketones and aldehydes carrying an alpha methyl group. The reagents used in this test are iodine and sodium hydroxide. Only methyl ketones or alcohols with this feature undergo this test.

Phenol on heating with Zn dust forms benzene.

2C6H5OH + Zn→2C6H6+Zn(OH)2

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