Assertion(A): In lucas test , 3o alcohols react immediately.
Reason (R): An equimolar mixture of anhydrous ZnCl and conc. HCl is called lucas reagent
a)Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not the correct explanation of A.
(c)A is true but R is false.
(d) A is false but R is true.
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Answer:
(c)A is true but R is false.
Explanation:
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Both assertion and reason are true but reason is not the correct explaination of assertion.
1)Lucas test is carried out to distinguish between 1° , 2° and 3° alcohols.
2)Lucas reagent is a solution of anhydrous ZnCl2 and concentrate HCl.
3) With 3° alcohols it gives turbidity immediately.This is because 3° cation is very stable and the reaction takes place quickly.
4)With 2° alcohols it does not give turbidity immediately, it takes 2-5 minutes.This is because 2° cation is less stable as compared to 3° cation.
5) With 1° alcohols,it does not give turbidity.This is because at room temperature Lucas reagent doesn't react with 1° alcohols.