Q29 / 160 · TS EAMCET 2006 · Chemistry

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 :

  • A
    I, II and III are correct
  • B
    Only II is correct
  • C
    Only I and III are correct
  • Correct answer
    D
    Only I and II are correct

Solution

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

Hence, the correct answer is option: 'D'.

Relevant Questions