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Please explain me these type of mcqsAmong the following, which is least acidic?A phenol B O-cresol C p-nitrophenol D p-chlorophenol

Please explain me these type of mcqsAmong the following, which is least acidic?A phenol B O-cresol C p-nitrophenol D p-chlorophenol

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Grade:12th pass

2 Answers

Rakesh patel
13 Points
3 years ago
Least acidic is phenol, because there is no any -I group, which increases the acidity. So correct order of acidity is C>B>D>A
shahbaz usmani
13 Points
3 years ago
I think o-cresol is least acidic because methyl group shows + inductive effect that means it increase the electron density on the oxygen of O-H bond as a result it leads to removal of hydrogen difficult making the molecule less acidic whereas no such group is attached on phenol showing + I effect leading to removal of oxygen easy as compared to ortho cresol
In the case of other two the groups attached on ring(nitro and chloro on other) shows -I effect they are electron withdrawing in nature
the order of acidic stregth in decreasing manner is C>D>A>B

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