The correct answer is Be and Al
The chlorides of both Be and Al have bridged structures in vapour phase.
Both metals form carbides which on hydrolysis gives methane,
Al_4Cl+12H_2O→4Al(OH_3)+3CH_4
Be_2C+2H_2O→2BeO+CH_4
Mg and Li both form nitides,
The only group 1 alkali metal that produces a nitride when burned in air is lithium. (This occurs frequently with alkaline earth metals, though) (group 2).
6Li+N_2→2Li_3N
3Mg+N_2→Mg_3N_2
Carbonates of both decomposed by heat,
Thermal instability exists in lithium carbonate and magnesium carbonate. When heated, they break down. As a result of their diagonal relationship, Li and Mg have similar properties.
MgCO_3→MgO+CO_2
Li_2CO_3→Li_2O+CO_2
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