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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 :
Options:
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 :
Solution:
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Verified Answer
The correct answer is:
Only I and II are correct
Reaction of ethyl alcohol with bleaching powder to form chloroform takes place as -
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}+\mathrm{Cl}_2 \longrightarrow \mathrm{CH}_3 \cdot \mathrm{CHO}+2 \mathrm{HCl}$
$\mathrm{CH}_3 \mathrm{CHO}+3 \mathrm{Cl}_2 \longrightarrow \mathrm{CCl}_3 \cdot \mathrm{CHO}+3 \mathrm{HCl}$
$2 \mathrm{CCl}_3 \cdot \mathrm{CHO}+\mathrm{Ca}(\mathrm{OH})_2 \longrightarrow 2 \mathrm{CHCl}_3$ $+(\mathrm{HCOO})_2 \mathrm{Ca}$
$\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{OH}+\mathrm{Cl}_2 \longrightarrow \mathrm{CH}_3 \cdot \mathrm{CHO}+2 \mathrm{HCl}$
$\mathrm{CH}_3 \mathrm{CHO}+3 \mathrm{Cl}_2 \longrightarrow \mathrm{CCl}_3 \cdot \mathrm{CHO}+3 \mathrm{HCl}$
$2 \mathrm{CCl}_3 \cdot \mathrm{CHO}+\mathrm{Ca}(\mathrm{OH})_2 \longrightarrow 2 \mathrm{CHCl}_3$ $+(\mathrm{HCOO})_2 \mathrm{Ca}$
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