Which of the following compounds gives a pink | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) The reaction of phenols with phthalic anhydride in the presence of concentrated $H_2SO_4$ is a condensation reaction that forms phthalein dyes. Fo

Vedclass · Accepted Answer

$2-$propylphenol

Vedclass · Answer

(A) The reaction of phenols with phthalic anhydride in the presence of concentrated $H_2SO_4$ is a condensation reaction that forms phthalein dyes. For a phenol to form a phthalein dye (which shows a pink colour in basic medium),it must have a free para-position relative to the hydroxyl $(-OH)$ group to allow for the electrophilic aromatic substitution $(EAS)$ by the phthalic anhydride intermediate. In $2$-propylphenol,the para-position is free,allowing the reaction to proceed to form the corresponding phthalein derivative,which turns pink upon treatment with $NaOH$.

Which of the following compounds gives a pink colour on reaction with phthalic anhydride in conc. $H_2SO_4$ followed by treatment with $NaOH$?

Similar Questions

Choose the incorrect option based on the reaction:
$(P)$ + $CH_3-CO-Cl \rightarrow (Q)$
Where $(P)$ is salicylic acid and the structure of $(Q)$ is given as:
$(Q)$ is a benzene ring with an $-OH$ group and a $-COO-CO-CH_3$ group at ortho position.

The $IUPAC$ name of picric acid is

Which of the following is the strongest acid?

Explain why the $-OH$ group in phenols is more strongly held as compared to the $-OH$ group in alcohols?

In the reaction sequence,phenol reacts with $HNO_2$ to form $X$,which then reacts with phenol in the presence of $H_2SO_4$ to form $Y$. Identify the major products $X$ and $Y$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module