A) auto-catalyst
B) bio-catalyst
C) positive catalyst
D) negative catalyst
Correct Answer: D
Solution :
The addition of 1% alcohol to chloroform acts as negative catalyst because in the presence of air and light chloroform oxidises into phosgene which is poisonous in nature. Therefore, a small quantity of alcohol is added to chloroform that retards its oxidation and also forms non-poisonous ethyl carbonate with \[COC{{l}_{2}}\]. \[\underset{chloroform}{\mathop{CHC{{l}_{3}}}}\,+\frac{1}{2}{{O}_{2}}\xrightarrow{air,\,\,light}\underset{phosgene}{\mathop{COC{{l}_{2}}}}\,+HCl\] ethyl carbonate \[\underset{\begin{smallmatrix} phosgene \\ \left( carbonyl\text{ }chloride \right) \end{smallmatrix}}{\mathop{COC{{l}_{2}}}}\,\,\,\,+\,2{{C}_{2}}{{H}_{5}}OH\to \]\[\underset{ethyl\,\,carbonate}{\mathop{{{({{C}_{2}}{{H}_{5}}O)}_{2}}CO}}\,\]
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