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Choose the correct statement...

Choose the correct statement

A

`LiAIH_(4)` cannot reduce isolated carbon - carbon double or triple bond

B

Borane and `LiAIH_(4)` have generally same reducing power and same mechanism

C

`LiAIH_(4)` can reduce isolated carbon - carbon double bond

D

`LiAIH_(4)` is a weak hydride doner than `NaBH_(4)`

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question, we need to evaluate each of the four statements regarding lithium aluminum hydride (LiAlH4) and its reducing properties. Let's analyze each statement step by step. ### Step 1: Analyze Statement 1 **Statement 1**: Lithium aluminum hydride cannot reduce isolated carbon-carbon double or triple bonds. - **Evaluation**: This statement is **correct**. Lithium aluminum hydride is a strong reducing agent, but it does not reduce isolated carbon-carbon double or triple bonds. It can only reduce these types of bonds if they are part of a conjugated system. ### Step 2: Analyze Statement 2 **Statement 2**: Borane and lithium aluminum hydride have generally the same reducing power. - **Evaluation**: This statement is **incorrect**. Borane (BH3) is a weaker reducing agent compared to lithium aluminum hydride. They do not have the same reducing power or mechanism. ### Step 3: Analyze Statement 3 **Statement 3**: Lithium aluminum hydride can reduce isolated carbon-carbon double bonds. - **Evaluation**: This statement is **incorrect**. As previously mentioned, lithium aluminum hydride cannot reduce isolated double or triple bonds unless they are part of a conjugated system. ### Step 4: Analyze Statement 4 **Statement 4**: Lithium aluminum hydride is a weaker hydride donor than NaBH4 (sodium borohydride). - **Evaluation**: This statement is **incorrect**. Lithium aluminum hydride is actually a stronger hydride donor than sodium borohydride. The bond between aluminum and hydrogen in LiAlH4 is weaker than the bond between boron and hydrogen in NaBH4, making LiAlH4 a more effective reducing agent. ### Conclusion After evaluating all four statements, the only correct statement is **Statement 1**: Lithium aluminum hydride cannot reduce isolated carbon-carbon double or triple bonds. ### Final Answer The correct statement is **Statement 1**. ---
To solve the question, we need to evaluate each of the four statements regarding lithium aluminum hydride (LiAlH4) and its reducing properties. Let's analyze each statement step by step. ### Step 1: Analyze Statement 1 **Statement 1**: Lithium aluminum hydride cannot reduce isolated carbon-carbon double or triple bonds. - **Evaluation**: This statement is **correct**. Lithium aluminum hydride is a strong reducing agent, but it does not reduce isolated carbon-carbon double or triple bonds. It can only reduce these types of bonds if they are part of a conjugated system. ### Step 2: Analyze Statement 2 ...
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