Answer
The following transformation can be obtained with oxymercuration-demercuration of alkenes.
Work Step by Step
The reaction will take place in following steps:
1) Electrophilic attack of $ ^+Hg(OAc)$ forms a mercurinium ion.
2) $OH^-$ attacks the most substituted carbon and opens the ring to give an organomercurial alcohol.
3) Demercuration with $NaBH_4$ replaces the mercuric fragment with hydrogen to give an alcohol.
