Which of the following alkali metal carbonates is/are water soluble and produce alkaline solution?

The properties of lithium and beryllium, and their compounds, differ far from those of the group $1$ and the group $2$ elements, and compounds may show closer similarities with group $2$ elements (particularly $\mathrm{Mg}$), than they show towards their own group. Similarly, $\mathrm{Be}$ is also closer to $\mathrm{Al}$.

What type of salt is formed by $\mathrm{Li}$ only,  in the group.

The properties of lithium and beryllium and their compounds differ far from those of the group $1$ and the group $2$ elements, and compounds may show closer similarities with the group $2$ elements (particularly $\mathrm{Mg}$), than they show towards their own group. Similarly, $\mathrm{Be}$ is also closer to $\mathrm{Al}$.

The properties of lithium and beryllium and their compounds differ far from those of the group $1$ and group $2$ elements and compound may show closer similarities with group- $2$ elements (particularly $\mathrm{Mg}$ ) then they show towards their own group. Similarly, $\mathrm{Be}$ is also closer to $\mathrm{Al}$.