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Directive Influence of Substituents

Assertion: La...

Question

Assertion: Larger the value of $p K_{a}$ , weaker is the acid.
Reason: High value of $K_{a}$ indicates a strong tendency of the acid to dissociate.

A

Both Assertion and Reason are true and Reason is the correct explanation of Assertion

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B

Both Assertion and Reason are true but Reason is not the correct explanation of Assertion

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C

Assertion is true but Reason is false

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D

Assertion is false but Reason is true

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E

Both Assertion and Reason are false

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Solution

The correct option is A Both Assertion and Reason are true and Reason is the correct explanation of Assertion
$p K_{a} = - l o g K_{a}$
Higher the value of $K_{a}$ , stronger is the acid. Therefore, larger the value of $p K_{a}$ , weaker is the acid.
Trifluoroacetic acid has pKa value of 0.5 whereas acetic acid has pKa value of 4.8
Acetic acid is weaker than trifluoroacetic acid.

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Similar questions

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)

If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)

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(c)

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(d)

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Assertion: 4-nitrophenol is more acidic than picric acid.
Reason: Phenol is a weaker acid than carbonic acid.

Q. Read the assertion and reason carefully to mark the correct option out of the options given below:

(a)

If both assertion and reason are true and the reason is the correct explanation of the assertion.

(b)

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(c)

If assertion is true but reason is false.

(d)

If assertion is false but reason is true.
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(a)If both assertion and reason are true and the reason is the correct explanation of the assertion.

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Reason: A figure formed by straight lines only is called a rectilinear figure.
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