Considering the reaction sequence given below, the correct statement(s) is(are)
1
P can be reduced to a primary alcohol using NaBH4.
2
Treating P with conc. NH4OH solution followed by acidification gives Q.
3
Treating Q with a solution of NaNO2 in aq. HCl liberates N2.
4
P is more acidic than CH3CH2COOH.