Chemistry - ALCOHOL & ETHER Question with Solution | TestHub
Given below are two statements:
Statement I: The acidic strength of mono substituted nitrophenol is higher than phenol because of electron withdrawing nitro group.
Statement II: -nitrophenol, -nitrophenol and -nitrophenol will have same acidic strength as they have one nitro group attached to the phenolic ring.
In the light of the above statements, choose the most appropriate answer from the options given below :
NEET 2022 (Phase 1)
Options:
Answer:
Solution:
The presence of the Nitro group in the ortho or para position decreases the electron density in the bond. As a result, it is easier to lose a proton from mono substituted nitro phenol Hence, ortho and para nitrophenols are stronger acids than phenol.
The acidic nature of nitrophenols increases in the order: meta ortho para.
Meta position shows only -I effect. Hence, it is less acidic than the para and ortho isomers.
Between para and ortho nitrophenols, para is more acidic due to the presence of an intramolecular hydrogen bonding that locks hydrogen of bond in ortho isomer.
