Advertisements
Advertisements
Question
Answer in brief.
Explain why p-nitrophenol is a stronger acid than phenol.
Advertisements
Solution
- In ρ-nitrophenol, nitro group (NO2) is an electron-withdrawing group present at para position which enhances the acidic strength (- I effect). The O – H bond is under strain and release of proton (H+) becomes easy. Further, ρ-nitrophenol ion is more stabilised due to resonance.
- Since the absence of electron-withdrawing group (like –NO2) in phenol at ortho and para position, the acidic strength of phenol is less than that of ρ-nitrophenol.
APPEARS IN
RELATED QUESTIONS
When vapours of tert.butyl alcohol are passed over hot copper, it gives _____________
Write the name of major product when anisole reacts HI at 398 K
Write Kolbe’s reaction.
How will you bring about the following conversions?
isopropyl alcohol to acetone
How will you bring about the following conversions?
acetone to 2-methylpropan-2-ol
What is the action of conc. H2SO4 on carbolic acid at 373 K.
Number of oxygen atoms present in salicylaldehyde are ______.
Which alcohol is difficult to oxidise?
In the Lucas test for alcohols, the appearance of turbidity is due to the formation of ____________.
In phenols, −OH group is attached to ___________ hybridised carbon.
Phenol is obtained from cumene ____________.
Sodium metal with ethyl alcohol gives __________ gas.
Isobutylene on hydroboration followed by oxidation with hydrogen peroxide in presence of base yields ______.
Carbolic acid is oxidised by acidified sodium dichromate to give ______.
In Dow process, chlorobenzene is converted into phenol by ____________.
Which of the following alcohols has tertiary allylic carbon?
\[\ce{Isopropyl alcohol + acidic K2Cr2O7 -> X}\]
Identify product 'X' in the above reactions.
Which among the following compounds is used to prepare solid fuel using calcium acetate?
Which of the following alcohols is least soluble in water?
The number of σ bonds in carbolic acid is ______.
Identify 'Z' in the following series of reaction:
\[\ce{Butan - 2 - ol ->[PCl3] X ->[alco. KOH] Y ->[i) H2SO4][ii) H-OH/heat] Z}\]
The compound which reacts fastest with Lucas reagent at room temperature is ______.
Which among the following phenolic compound is most acidic in nature?
The acid, which contains both -OH and -COOR groups is ______.
Which of the following compounds reacts immediately with Lucas reagent?
The order of reactivity of hydrogen halides with ether is as follows.
Write the product when 1°, 2° and 3° alcohol vapours are passed over hot copper.
Arrange the following compounds in order of decreasing acidity:
