1.

Explain the laboratory preparation of chloroform.

Answer»

Solution :Haloform reaction: Chloroform is prepared in the laboratory by the reaction between ethyl alcohol with bleaching powder followed by the distillation of the final product chlorolorm Bleaching powder acts as a source of chlorine and calcium hydroxide. The reaction take PLACE in 3 steps.
STEP 1: OXIDATION-
`underset("Ethyl alcohol")(CH_3 - CH_2OH) + Cl_2 to underset("Acetaldehyde")(CH_3CHO) + 2HCl`
Step 2 : CHLORINATION-
`underset("Acetaldehyde")(CH_3CHO + 3Cl_2) to underset("Chloral")(Cl_3CHO) + underset("Calcium formate")((HCOO)_2Ca)`


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