Answer
Verified
35.1k+ views
Hint: You need to know that the compound will be more acidic when the conjugate base after releasing the hydrogen ion is more stable. If the conjugate acid is less stable, then the compound will be less acidic.
Complete step by step answer:
Additional Information:
Note: In ethanol, the +I effect decreases the stability of the conjugate base. So, it is less acidic than phenol. In cresol, since there is no mesomeric effect in the meta position, it shows +I effect and decreases the stability of the conjugate base. Hence it is less acidic than phenol. In benzyl alcohol, the conjugate base is destabilized by the +I effect. Also benzyl alcohol is less acidic than phenol.
Complete step by step answer:
We know that phenol contains only OH groups. If it releases the $ {{\text{H}}^{\text{ + }}} $ ion, the conjugate base is phenoxide ion. In p-nitrophenol, after the releasing of $ {{\text{H}}^{\text{ + }}} $ ions, the negative charge on the phenoxide ion will be stabilized by strong –M effect of nitro group in the para position. So, the conjugate base is more stable than phenol. So, p-nitrophenol is more acidic than phenol.
Therefore, it is clear that phenol is less acidic than p-nitrophenol.
So, the correct option is (A).
Anything which stabilizes the conjugate base will increase the acidity. Therefore $p_{Ka}$ is also a measure of how stable the conjugate base is. Put another way, strong acids have weak conjugate bases, and vice versa.
Recently Updated Pages
If a wire of resistance R is stretched to double of class 12 physics JEE_Main
The path difference between two waves for constructive class 11 physics JEE_MAIN
What is the difference between solvation and hydra class 11 chemistry JEE_Main
IfFxdfrac1x2intlimits4xleft 4t22Ft rightdt then F4-class-12-maths-JEE_Main
Sodium chloride is purified by passing hydrogen chloride class 11 chemistry JEE_Main
Consider the following oxyanions PO43P2O62SO42MnO4CrO4S2O52S2O72 class 11 chemistry JEE_Main
Other Pages
Excluding stoppages the speed of a bus is 54 kmph and class 11 maths JEE_Main
The mole fraction of the solute in a 1 molal aqueous class 11 chemistry JEE_Main
The strongest oxidising agent among the following is class 11 chemistry JEE_Main
Assertion Internal forces cannot change linear momentum class 11 physics JEE_Main
Differentiate between homogeneous and heterogeneous class 12 chemistry JEE_Main
Oxidation state of S in H2S2O8 is A 6 B 7 C +8 D 0 class 12 chemistry JEE_Main