Assertion (A):( CH_3)_3 C - O - CH_3 gives ( CH_3)_3 C - I and CH_3 OH on reaction with HI. Reason (R): The reaction occurs by S_N 1 mechanism.

Assertion $\displaystyle (A):\left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{O}-\mathrm{CH}_{3}$ gives $\displaystyle \left(\mathrm{CH}_{3}\right)_{3} \mathrm{C}-\mathrm{I}$ and $\displaystyle \mathrm{CH}_{3} \mathrm{OH}$ on reaction with HI. Reason (R) : The reaction occurs by $\displaystyle \mathrm{S}_{\mathrm{N}} 1$ mechanism.