how will you distinguish between primary and secondary alcohol using lucas reagent
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Answer:
Explanation:
Solution of ZnCl
2
in conc. HCl is known as Lucas reagent.
Application : It is used to differentiate primary, secondary and tertiary alcohols.
On adding the alcohol to Lucas reagent, a tertiary alcohol reacts immediately forming a ppt of alkyl chloride. If the ppt. appears after few minutes, the alcohols is secondary. If no ppt, is obtained in cold the alcohol is primary.
RCH
2
OH
Con.HCl
AnhydrousZnCl,
No Reaction
1
o
Alcohol (At room temperature)
R
2
CHOH
Con.HCl
AnhydrousZnCl,
R
2
CgCl↓+H
2
O
2
o
Alcohol (After 5 minute)
R
3
CHOH
Con.HCl
AnhydrousZnCl,
R
3
CCl↓+H
2
O
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