The total number of basic groups in the following form of lysine is

In the scheme given below, the total number of intra molecular aldol condensation products formed from Y is ____________.

Amongst the following, the total number of compound soluble in aqueous NaOH is _________.

The value of $$n$$ in the molecular formula $$\mathrm{Be_n Al_2Si_6O_{18}}$$ is ___________.