The alkali metal that reacts with nitrogen directly to form nitride is:

L i

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N a

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K

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R b

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Solution

The correct option is D $L i$
Alkali metals that react with nitrogen directly to form nitride is $L i$ . This anamolous behaviour is due to its small size and high polarizing power.
$6 L i + N_{2} (g) \to 2 L i_{3} N$
Hence, option A is correct.

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