In any group second period element exhibit anomalous properties. Correct statements about this is/are.

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The first member of $p$ -block element displays greater ability to form $p π - d π$ multiple bonds to itself and to the other second period elements, compared to subsequent members of the group

All second period elements exhibit diagonal relationship.

Generally maximum covalency of the first member of each group cannot exceed four

Anamalous behavior is due to small size, large charge/radius ratio and high electronegativity of the elements

answer is B, D.

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Detailed Solution

Due to the absence of d-subshell in valence shell, second period element do not exhibit maximum covalence beyond 4. 2nd period element from stronger $p π - p π$ bonds, not $p π - d π$ bonds. Anomalous behavior is due to small size, High electronegativity. Diagonal relationship exist only upto group number 14.

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