An organic compound A on treatment with `CHCl_(3)` and KOH gives B and C, both of which, in turn, gives the same compound D when

An organic compound A on treatment with `CHCl_(3)` and KOH gives B and C, both of which, in turn, gives the same compound D when distilled with Zn dust. Oxidation of D yields E of the fromula `C_(7)H_(6)O_(2)`. The Na salt of E on heating with soda lime give F which can be also be obtained by distilling A with Zn dust Identify F.
A.