ALKENES lead to HYDRATION in Markovnikov's way. Thus \[{{(C{{H}_{3}})}_{3}}CCH=C{{H}_{2}}\xrightarrow[(II)\,NAB{{H}_{4}}]{(i)\,Hg{{(OAc)}_{2}}.{{H}_{2}}O}{{(C{{H}_{3}})}_{3}}C\overset{OH}{\mathop{\overset{|}{\mathop{C}}\,}}\,HC{{H}_{3}}\]