Which of the following reagents is used in th | vedclass

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(D) The conversion of phenol to picric acid $(2,4,6-	ext{trinitrophenol})$ is an electrophilic aromatic substitution reaction known as nitration.Phen

Vedclass · Accepted Answer

conc. $HNO_3 +$ conc. $H_2SO_4$

Vedclass · Answer

(D) The conversion of phenol to picric acid $(2,4,6-	ext{trinitrophenol})$ is an electrophilic aromatic substitution reaction known as nitration.Phenol reacts with concentrated nitric acid $(HNO_3)$ in the presence of concentrated sulphuric acid $(H_2SO_4)$ to form picric acid.The concentrated $H_2SO_4$ acts as a catalyst and helps in the generation of the nitronium ion $(NO_2^+)$,which is the electrophile.

Acid	$pK_a$
$(i)$ Phenol	$a. 10$
$(ii)$ $p-$Nitrophenol	$b. 7.1$
$(iii)$ Ethyl alcohol	$c. 16$
$(iv)$ Picric acid	$d. 0.78$

Which of the following reagents is used in the conversion of phenol to picric acid?

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Which of the following substances will give a characteristic dark color with a solution of $FeCl_3$?

Match the following acids with their respective $pK_a$ values:
Acid $pK_a$
$(i)$ Phenol $a. 10$
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$(iii)$ Ethyl alcohol $c. 16$
$(iv)$ Picric acid $d. 0.78$

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