In complex hydrides, hydride ions act as ligand and are coordinated to metal ions. These hydrides are good reducing agents. Which of the following hydrides is not a complex hydride?

L i A I H_{4}

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N a B H_{4}

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(A l H_{3})_{n}

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L i B H_{4}

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Solution

The correct option is C $(A l H_{3})_{n}$
$(A l H_{3})_{n}$ is a polymeric hydride like $(B e H_{2})_{n}, (M g H_{2})_{n}$ etc.
Whereas, $L i A l H_{4}$ , $N a B H_{4}$ and $L i B H_{4}$ are complex co-ordinate hydrides.
Hence option C is correct.

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