Three elements X, Y and Z are in the 3rd period of the periodic table. The oxides of X, Y and Z, respectively, are basic, amphoteric and acidic. The correct order of the atomic numbers of X, Y and Z is:

Yield of 4-hydroxypentan-2-one is low because aldol and diacetone alcohol are also formed.

On moving Left to Right along a period.
Atomic Radius → decreases.
Electronegativity → Increases.
Electron gain enthalpy → Increases.
Ionisation Enthalpy → Increases

Ionization enthalpy: B < Be < O < N

IE of N > O [Due to half-filled configuration]

IE of Be > B [Due to penetration effect]

Species =CH4 ${}_{}^{}$ $N{H}_4^{+}$ $B{H}_4^{?}$ ${}_{}^{}$

Electrons =101010