Question

Distingush between p,s,t alcohals
​

Answer 1

Answer:

would use the Lucas test to distinguish between a primary and a secondary alcohol.

Explanation:

The Lucas test differentiates between primary and secondary alcohols.

It is based on the difference in reactivity of the alcohols with

HCl

in an

SN1

reaction:

ROH + HCl→RCl+H2O

..............

It works because secondary carbocations are more stable and form faster than primary carbocations.

The Lucas reagent is an equimolar mixture of

ZnCl

2

and

HCl

.

You add a few drops of your alcohol to the reagent in a test tube

A secondary alcohol will react within 3 min to 5 min to form the alkyl halide, which is insoluble and forms an oily layer.

CH3CH2CH2CH(OH)CH3

 pentan-2-ol+HCl

ZnCl2

,HClmm

−−−−−−−−→

CH3

CH2

CH2

CHClCH3



2-chloropentane +H2O

.................................

Hope this helps you............