Assertion :STATEMENT 1: Silicon exists only in diamond-like structure while carbon exists both in diamond and graphite forms. Reason: STATEMENT 2: Carbon can show pronounced $p π - p π$ bonding while silicon shows negligible extent of $p π - p π$ bonding.

Statement 1 is True, statement 2 is True; statement 2 is a correct explanation for
statement 1.

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Statement 1 is True, statement 2 is True; statement 2 is not a correct explanation for
statement 1.

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Statement 1 is True, statement 2 is False.

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Statement 1 is False, statement 2 is True.

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Solution

The correct option is A Statement 1 is True, statement 2 is True; statement 2 is a correct explanation for
statement 1.
Carbon has pronounced $p π - p π$ bonding (eg: in graphite). But silicon, because of its larger size, shows a negligible tendency to form $p π - p π$ bond.

Hence silicon exists only in diamond-like form.

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Assertion :STATEMENT 1: Silicon exists only in diamond-like structure while carbon exists both in diamond and graphite forms. Reason: STATEMENT 2: Carbon can show pronounced pπ−pπ bonding while silicon shows negligible extent of pπ−pπ bonding.

Assertion :STATEMENT 1: Silicon exists only in diamond-like structure while carbon exists both in diamond and graphite forms. Reason: STATEMENT 2: Carbon can show pronounced $p π - p π$ bonding while silicon shows negligible extent of $p π - p π$ bonding.