Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa

Among the following acids which has the lowest pK_{a} value?

  • Option 1)

    CH_{3}COOH

  • Option 2)

    \left ( CH_{3} \right )_{2}CH-COOH

  • Option 3)

    HCOOH

  • Option 4)

    CH_{3}CH_{2}COOH

 

Answers (1)

best_answer

As we learnt in 

Value of Ka -

K_{a}=\frac{[H^{+}]\:[\bar{X}]}{[HX]}


P(K_{a})=-log(K_{a})

- wherein

At a given temperature T,  Ka is a measure of the strength of the acid  HX. Ka  is dimensionless quantity.

 

 

Higher the pK_{a} value, weaker is the acid. Hence, stronger acid has lower pK_{a}  value.

In given options, HCOOH is the strongest acid.


Option 1)

CH_{3}COOH

This option is incorrect

Option 2)

\left ( CH_{3} \right )_{2}CH-COOH

This option is incorrect

Option 3)

HCOOH

This option is the correct

Option 4)

CH_{3}CH_{2}COOH

This option is incorrect

Posted by

Plabita

View full answer

JEE Main high-scoring chapters and topics

Study 40% syllabus and score up to 100% marks in JEE

Similar Questions

Trending Articles/News

anam-khan

JEE Advanced 2024: Chemical engineering cut-offs at IITs; know opening, closing ranks
anam-khan

IIT JEE Mains Result 2024 Session 2: How is overall merit list prepared?
anam-khan

JEE Mains Session 2 result 2024 soon; List of top NITs in India

Latest Question