Complete the following reactions :
(a)
(b)

Explanation

(a)
(b)
( c)
(d)
( e) Due to steric hinderance of bulky `t-butyl` and isopropyl groups in ketone and bulky `t-butyl` group in `G.R`., the reaction fails and does not give `3^@` alcohol. Rather `H^(Ө)` (hydride ion) transfer from the `beta-position` of `G.R` to the `(C = O)` group takes place through a cyclic `T.S`. to give `2^@` alcohol.