Single Choice

Which of the following is the strongest acid?

A$$HCOOH\ (pK_{a}=3.77)$$
Correct Answer
B$$C_{6}H_{5}COOH\ (pK_{a}=4.22)$$
C$$CH_{3}COOH\ (pK_{a}=4.71)$$
D$$CH_{3}CH_{2}COOH\ (pK_{a}=4.88)$$

Solution

Lower the pKa value, higher is the acid dissociation constant and so, higher is the acidic strength.

Hence, option A with least $$pK_a$$ value is the correct answer.

Option A is correct.

SIMILAR QUESTIONS

Physical World

In the presence of $$H_2SO$$ concentrated sulphuric acid, acetic acid reacts with ethyl alcohol to produce :

Physical World

Based on $$pK_a$$ values the order of decreasing acidity of carboxylic acid molecules containing EWG must be? $$CF_3COOH, \; CCl_3COOH, \; HCCl_2COOH, \; NO_2CH_2COOH, \; FCH_2COOH, \\ ClCH_2COOH, \; BrCH_2COOH, \; HCOOH, \; ClCH_2CH_2COOH, \; C_6H_5COOH, \; \\ C_6H_5CH_2COOH, \; CH_3COOH, \; CH_3CH_2COOH$$.

Physical World

Among the following acids which has the lowest $$pKa$$ value

Physical World

(i) $$F_3C-COOH$$ (ii) $$CH_3COOH$$ (iii) $$C_6H_5COOH$$ (iv) $$CH_3CH_2COOH$$ Correct order of $$pK_a$$ value is?

Physical World

The decreasing order of $$ pK_a $$ value of the following is:

Physical World

Which of the following statements are correct?

Physical World

$$O_2N-CH_2-COOH$$ has lower $$pK_a$$ value than $$CH_3COOH$$.

Physical World

Which of the following statements are correct ?

Physical World

Which of the following has the highest $$p{K}_{a}$$ value?

Physical World

Which of the following as the lowest $$p{K}_{a}$$ value?

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