question_answer

Which one of the following is not a method for preparing chloroform? (i) Heating ethyl alcohol with chlorine and alkali. (ii) Heating acetone with bleaching powder and water. (iii) Heating chloral hydrate with aqueous sodium hydroxide. (IV) Distillation of acetone over iron filings and water.

A)  II                                           

B)  I

C)  III                                          

D)  IV

Correct Answer: D

Solution :

                 (i) \[+HCOONa+5NaCl+5{{H}_{2}}O\] (ii) \[\underset{\begin{smallmatrix}  \text{bleaching}\, \\  \text{powder} \end{smallmatrix}}{\mathop{CaOC{{l}_{2}}}}\,+{{H}_{2}}O\xrightarrow{{}}Ca{{(OH)}_{2}}+C{{l}_{2}}\] \[C{{H}_{3}}COC{{H}_{3}}++3C{{l}_{2}}\xrightarrow{{}}CC{{l}_{3}}COC{{H}_{3}}+3HCl\]\[+{{(C{{H}_{3}}COO)}_{2}}Ca\] (iii) \[\underset{chloral\,hydrate}{\mathop{{{C}_{2}}HC{{l}_{3}}{{(OH)}_{2}}}}\,+NaOH\xrightarrow{\Delta }CHC{{l}_{3}}\] \[+HCOONa+{{H}_{2}}O\] (IV) Distillation of acetone over iron filings and water cannot produce chloroform.