Observe the following statements : I. Bleaching powder is used in the preparation of chloroform. II.…

Observe the following statements : I. Bleaching powder is used in the preparation of chloroform. II. Bleaching powder decomposes in the presence of $\mathrm{CoCl}_2$ to liberate $\mathrm{O}_2$. III. Aqueous $\mathrm{KHF}_2$ is used in the preparation of fluorine. The correct combination is :
  1. I, II and III are correct
  2. Only II is correct
  3. Only I and III are correct
  4. Only I and II are correct

Solution

Reaction of ethyl alcohol with bleaching powder to form chloroform takes place as - $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}+\mathrm{Cl}_2 \longrightarrow \mathrm{CH}_3 \cdot \mathrm{CHO}+2 \mathrm{HCl}$ $\mathrm{CH}_3 \mathrm{CHO}+3 \mathrm{Cl}_2 \longrightarrow \mathrm{CCl}_3 \cdot \mathrm{CHO}+3 \mathrm{HCl}$ $2 \mathrm{CCl}_3 \cdot \mathrm{CHO}+\mathrm{Ca}(\mathrm{OH})_2 \longrightarrow 2 \mathrm{CHCl}_3$ $+(\mathrm{HCOO})_2 \mathrm{Ca}$

Asked in: AP EAMCET 2006

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