Question:
When will be the acidic character of carboxylic acid higher in following cases ?
When will be the acidic character of carboxylic acid higher in following cases ?
Show Hint
A stronger acid has a larger \(K_a\) and a smaller \(pK_a\).
Updated On: Oct 1, 2026
- Lower \(K_a\) and \(pK_a\) values
- Lower \(K_a\) value and higher \(pK_a\) value
- Higher \(K_a\) value and lower \(pK_a\) value
- Higher \(K_a\) and \(pK_a\) values
Show Solution
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
\(K_a\) measures how far an acid ionises. \(pK_a = -\log K_a\), so the two move in opposite directions.
Step 2: Detailed Explanation
A larger \(K_a\) means more ionisation and hence a stronger acid. Since \(pK_a = -\log K_a\), a larger \(K_a\) gives a smaller \(pK_a\).
So higher acidic character goes with higher \(K_a\) and lower \(pK_a\), which is option (C).
Options (A), (B) and (D) pair the values in ways that cannot hold, because \(K_a\) and \(pK_a\) cannot both be lower or both be higher.
Final Answer:
Acidity is greater when \(K_a\) is higher and \(pK_a\) is lower, option (C). \[ \boxed{\text{High }K_a,\ \text{low }pK_a\ \text{(C)}} \]
\(K_a\) measures how far an acid ionises. \(pK_a = -\log K_a\), so the two move in opposite directions.
Step 2: Detailed Explanation
A larger \(K_a\) means more ionisation and hence a stronger acid. Since \(pK_a = -\log K_a\), a larger \(K_a\) gives a smaller \(pK_a\).
So higher acidic character goes with higher \(K_a\) and lower \(pK_a\), which is option (C).
Options (A), (B) and (D) pair the values in ways that cannot hold, because \(K_a\) and \(pK_a\) cannot both be lower or both be higher.
Final Answer:
Acidity is greater when \(K_a\) is higher and \(pK_a\) is lower, option (C). \[ \boxed{\text{High }K_a,\ \text{low }pK_a\ \text{(C)}} \]
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