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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)

If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)

If assertion is true but reason is false.

(d)

If assertion is false but reason is true.
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)

If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)

If assertion is true but reason is false.

(d)

If assertion is false but reason is true.
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)If both assertion and reason are true but reason is not the correct explanation of the assertion.

(c)If assertion is true but reason is false.

(d)If assertion is false but reason is true.
Assertion : EV(M

^{2 +}

/M) value for copper is positive (+0.34V).
Reason : High ionization enthalpy and low heat of hydration energy

Q. Assertion : Amount of cyanocobalamine required daily is 3 mcg
Reason : Its deficiency causes pernicious anaemia

Q. (i)
Assertion: A circle is not a rectilinear figure.
Reason: A figure formed by straight lines only is called a rectilinear figure.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.
(ii)
Assertion: All right angles are equal to one another.
Reason: A unique line passes through a single point.
(a) Both Assertion and Reason are true and Reason is a correct explanation of Assertion.
(b) Both Assertion and Reason are true but Reason is not a correct explanation of Assertion.
(c) Assertion is true and Reason is false.
(d) Assertion is false and Reason is true.

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