JEE Main202427 Jan 2024Morning ShiftChemistryGeneral Organic ChemistryActual
The ascending order of acidity of – OH group in the following compounds is : (A) Bu – OH Choose the correct answer from the options given below :
Options
- A( A ) < ( D ) < ( C ) < ( B ) < ( E )
- B( C ) < ( A ) < ( D ) < ( B ) < ( E )
- C( C ) < ( D ) < ( B ) < ( A ) < ( E )
- D( A ) < ( C ) < ( D ) < ( B ) < ( E )
Correct answer
D. ( A ) < ( C ) < ( D ) < ( B ) < ( E )
Step-by-step solution
The decrease in electron density of the O - H bond of o,p-dinitrophenol, the polarity of O - H bond decreases. The electron withdrawing group - NO 2 ), withdraws electrons and disperses the negative charge. Therefore, - NO 2 group stabilizes the phenoxide ion. Hence, o,p-dinitrophenol is more acidic than p-nitrophenol and phenol. OMe is an electron donating group, hence it increases electron density, there why making it less acidic. Bu - OH is an aliphatic alcohol. In phenoxide ion the negative charge is delocalize