(CH3)3CClNaCN−−−−→Adil.H2SO4−−−−−−→B. Compund B is
(CH3)3COH
CN− is a strong base since the substrate is a tert-halide, it mainly undergoes elimination reaction forming alkene (A). In presence of dil. H2SO4, alkenes undergo hydration in Markovnikov's way.