Question

Observe the following statements :
I. Bleaching powder is used in the preparation of chloroform.
II. Bleaching powder decomposes in the presence of $CoCl _{2}$ to liberate $O _{2}$
III. Aqueous $KHF _{2}$ 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
• D. Only I and II are correct

Answer 1

Answer: (D)

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