Considering the reaction sequence given below, the correct statement(s) is(are)

Options

A. P can be reduced to a primary alcohol using `NaBH_4`
B. Treating P with conc. `NH_4 OH` solution followed by acidification gives Q.
C. Treating Q with a solution of `NaNO_2` in aq. HCl liberates `N_2`.
D. P is more acidic than `CH_3 CH_2 COOH`