Question:
Identify the 'A' in the following reaction.
\(\text{CaC}_2+\text{H}_2\text{O}\rightarrow \text{A}+\text{Ca(OH)}_2\)
Identify the 'A' in the following reaction.
\(\text{CaC}_2+\text{H}_2\text{O}\rightarrow \text{A}+\text{Ca(OH)}_2\)
\(\text{CaC}_2+\text{H}_2\text{O}\rightarrow \text{A}+\text{Ca(OH)}_2\)
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Calcium carbide gives the simplest alkyne with water.
Updated On: Oct 1, 2026
- Ethene
- Ethyne
- Propene
- Propyne
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Concept:
Calcium carbide contains the carbide ion \(\text{C}_2^{2-}\). It is hydrolysed by water, taking two protons.
Step 2: Reaction:
\[ \text{CaC}_2 + 2\text{H}_2\text{O} \rightarrow \text{HC}\equiv\text{CH} + \text{Ca(OH)}_2 \]
So A is ethyne (acetylene).
Step 3: Check options:
Ethene and propene need double bonds, which carbide does not give. Propyne forms from magnesium carbide \(\text{Mg}_2\text{C}_3\), not from calcium carbide.
Final Answer:
A is ethyne, option (B). \[ \boxed{\text{Ethyne}} \]
Calcium carbide contains the carbide ion \(\text{C}_2^{2-}\). It is hydrolysed by water, taking two protons.
Step 2: Reaction:
\[ \text{CaC}_2 + 2\text{H}_2\text{O} \rightarrow \text{HC}\equiv\text{CH} + \text{Ca(OH)}_2 \]
So A is ethyne (acetylene).
Step 3: Check options:
Ethene and propene need double bonds, which carbide does not give. Propyne forms from magnesium carbide \(\text{Mg}_2\text{C}_3\), not from calcium carbide.
Final Answer:
A is ethyne, option (B). \[ \boxed{\text{Ethyne}} \]
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