SELECT * FROM question_mgmt as q WHERE id=3095 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=54 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Arrange benzene, n-hexane and ethyne in decreasing order of acidic behaviour. Also give reason for this behaviour.

Answer:

Acidic character of species is defined on the basis of ease with which it can lose its H-atoms.

The hybridization state of carbon in the given compound is:

As the s-character increases, the electronegativity of carbon atom increases and the electrons of C-H bond pair lie closer to the carbon atom. As a result, partial positive charge of H- atom increases and H+ ions are set free.

The s-character increases in the order:

sp3 < sp2 < sp

Thus, the decreasing order of acidic behaviour is Ethyne > Benzene > Hexane.


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