Question

6) Which of the following Brønsted acids has the LOWEST (most negative) pKa value? A) CF3CH2OH     ...

6) Which of the following Brønsted acids has the LOWEST (most negative) pKa value?

A) CF3CH2OH     

B) CF3CH2CH2OH         

C) CCl3CH2OH           

D) CH2FCH2OH
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Homework Answers

Answer #1

answer : A) CF3CH2OH     

explanation:

more acidity means low pKa value.

here two more electronegative atoms are connected to carbon . F and Cl. F is the most electronegative atom.

when more electronegative atom connected to carbon they pull electrons towards itself so OH bond becomes weaker and easily loose H+ ion that means acididity more. acidity more pKa value is less.

here it is important to note that B is also having 3 F atom but it is far away from OH bond . when electronegative atoms are far away from OH group acidity decreases

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