Which of the following compounds gives trichloromethane on distilling with bleaching powder?

Options

A. A) methanal
B. B) phenol
C. C) ethanol
D. D) methanol

Answer

D

Explanation

(i) Alcohol is first oxidised to acetaldehyde by chlorine,
  `[CI_(2)+H_(2)Oto 2HCI +O]`
  `CH_(3)CH_(2)OH+O to CH_(3)CHO+H_(2)O`
(ii) Acetaldehyde then reacts with chlorine to form chloral
`CH_(3)CHO+3Cloverset("chlorination")toCCI_(3)CHO+3HCI`
(iii)Chloral, thus formed, is hydrolysed by calcium hydroxide.
`CCI_(3)CHO+Ca(OH)_(2)to2CHCl_(3)+(HCOO)_(2)Ca`.