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Lithium and beryllium unlike their other respective group members form compounds with pronounced ionic character.
Reason: Lithium and Magnesium have similar properties due to diagonal relationship.
A
Both A and R are true and R is the correct explanation of A
B
Both A and R are true but R is NOT the correct explanation of A
C
A is true but R is false
D
A is false but R is true
Detailed Solution
Lithium and beryllium, being the smallest members of their groups with high polarising power, actually form compounds with pronounced covalent (not ionic) character — so the Assertion is false. However, Lithium and Magnesium do show similar properties due to their diagonal relationship in the periodic table, so the Reason is true (though it is unrelated to, and does not explain, the false Assertion).