Question:
Identify false statement regarding lithium aluminium hydride?
Identify false statement regarding lithium aluminium hydride?
Show Hint
LiAlH4 is made from lithium hydride and aluminium chloride, not from lithium hydroxide.
Updated On: Nov 13, 2026
- It is obtained by reaction of lithium hydroxide with aluminium chloride.
- It is colourless solid.
- It reacts violently with water.
- It is used as reducing agent in organic synthesis.
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Lithium aluminium hydride, \(\text{LiAlH}_4\), is prepared by reacting lithium hydride with aluminium chloride in dry ether.
Step 2: Reaction
\( 4\text{LiH} + \text{AlCl}_3 \rightarrow \text{LiAlH}_4 + 3\text{LiCl} \)
Step 3: Check the Statements
(A) says it is obtained from lithium hydroxide, which is false. (B) It is a colourless solid, true. (C) It reacts violently with water, true. (D) It is a strong reducing agent in organic synthesis, true.
Step 4: Compare the options
The false statement is option (A).
Final Answer:
The false statement is that it is obtained from lithium hydroxide and aluminium chloride. \[ \boxed{\text{(A) }\text{It is obtained by reaction of lithium hydroxide with aluminium chloride.}} \]
Lithium aluminium hydride, \(\text{LiAlH}_4\), is prepared by reacting lithium hydride with aluminium chloride in dry ether.
Step 2: Reaction
\( 4\text{LiH} + \text{AlCl}_3 \rightarrow \text{LiAlH}_4 + 3\text{LiCl} \)
Step 3: Check the Statements
(A) says it is obtained from lithium hydroxide, which is false. (B) It is a colourless solid, true. (C) It reacts violently with water, true. (D) It is a strong reducing agent in organic synthesis, true.
Step 4: Compare the options
The false statement is option (A).
Final Answer:
The false statement is that it is obtained from lithium hydroxide and aluminium chloride. \[ \boxed{\text{(A) }\text{It is obtained by reaction of lithium hydroxide with aluminium chloride.}} \]
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