Question

Arrange benzene hexane and ethyl in decreasing order of acidic.Also give reason

Answer 1

we know, acidity is directly proportional to S - character , means higher the S - character, higher is the acidity . so, first of all we have to find out hybridisation of all the given compounds and then find then compare the acidity by comparison of S - character . increasing order of S - character :  sp³ - hybridized ( 25% , s - character ) < sp² - hybridized ( 33.33%, S - character ) < sp - hybridized ( 50% , S - character )   benzene : all C - atoms are sp² hybridized so, S - character is only 33.33 % .  n - hexane : all C - atoms are sp³ hybridized so, S - character is only 25% .   Ethyne : {H-CΞC - H } , hence triple bond between C- atoms . so, 50 % , S - character in Ethyne .  hence, it is clear that increasing order of acidity : Ethyne < benzene < n-Hexane    Thanks Hope it helps