tert-Butyl chloride is produced by the reaction of tert-butyl alcohol with hydrogen chloride.
In the laboratory, concentrated hydrochloric acid is used.
The conversion entails a SN1 reaction as shown below.

The overall reaction, therefore, is:
Because tert-butanol is a tertiary alcohol, the relative stability of the tert-butyl carbocation in the step 2 allows the SN1 mechanism to be followed, whereas a primary alcohol would follow an SN2 mechanism.
tert-Butyl chloride is produced by the reaction of tert-butyl alcohol with hydrogen chloride. In the laboratory, concentrated hydrochloric acid is used. The conversion entails a SN1 reaction as shown below.
The overall reaction, therefore, is:
Because tert-butanol is a tertiary alcohol, the relative stability of the tert-butyl carbocation in the step 2 allows the SN1 mechanism to be followed, whereas a primary alcohol would follow an SN2 mechanism.
Tert-Butyl chloride