The given property of Be and Al is similar due to diagonal relationship :

electronegativity

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electropositivity

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ionisation energy

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none of these

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Solution

The correct option is B electronegativity
Option $(A)$ is correct.
Due to diagonal relationship $B e$ and $A l$ have same value of electronegativity.
Both have almost same size and thus favour for covalent bonding, forms covalent compounds having low melting point and soluble in organic solvent.

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