Identify the products:
a.
b.
c.

Explanation

a.
b.
c. i. With a base, it is Claisen-Schmidt reaction. The base removes more acidic `alpha`-H form the `(overset(1)CH_(3) of overset (1) CH_(3) overset(2)CO overset(3)CH_(2) overset(4)CH_(3))`. The carbanion `overset(Θ)(C )H_(2)COCH_(2)CH_(3)` adds to PhCHO followed by dehydration to give `PhCH=CHCO CH_(2)CH_(3)` (C ).

ii. With an acid, `PhCH=overset(o+)(O)H` adds to `beta`-C of enol
`(Me underset(OH)underset(|)C=overset(beta)CH Me)` since the enol is more substituted and more stable to give
`(PhCH=overset(Me)overset(|)(C)-underset(O)underset(||)C-Me)` (D).
`underset((A))PhCH =O overset(H^(o+))rarr PhCH=overset(o+)(O)H`