MCQ
The correct acidity order of the following is
- ✓$(III) > (IV) > (II) > (I)$
- B$(IV) > (III) > (I) > (II)$
- C$(III) > (II) > (I) > (IV)$
- D$(II) > (III) > (IV) > (I)$
✓
Answer
Correct option: A.
$(III) > (IV) > (II) > (I)$
a
Decreasing order of acidic strength is $I I I > I V > I I > I$
Decreasing order of acidic strength is $I I I > I V > I I > I$
Carboxylic acid is more acidic than phenol. When an electron releasing group is present in the para position to $-COOH$ group in aromatic carboxylic acid, the acidity is reduced.
When $Cl$ atom is present in the para position to $-OH$ group in phenol, it increases its acidity.
Here $Cl$ atom withdraws electron density from the ring and stabilizes the phenoxide ion.
Option $A$ is correct.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Which of the following reaction is expected to take place by $S_N2$ mechanism ?
→A vessel at $1000\,K$ contains $CO_2$ with a pressure of $0.5\, atm.$ Some of the $CO_2$ is converted into $CO$ on the addition of graphite. If the total pressure at equilibrium is $0.8\, atm,$ the value of $K$ is .....$atm$
→The Empirical formula of a compound is $C{H_2}O$ and its molecular weight is $120$. The molecular formula of the compound is
→Consider, $PF _{5}, BrF _{5}, PCl _{3}, SF _{6},\left[ ICl _{4}\right]^{-}, ClF _{3}$ and $IF _{5}$
→Amongst the above molecule(s)/ion(s), the number of molecule(s)/1on(s) having $sp ^{3} d ^{2}$ hybridisation is $........$
Among the structures given below which one is not the correct structure of $N_3^-$ ?
→The normal $f.p.$ of nitrobenzene is $278.82\, K$ . If a non-volatile solute is dissolved in it and a solution of $0.25$ molality is prepared. The observed $f.p.$ of the solution is $276.82\, K$ . Evaluate $K_f$ of nitrobenzene ......... $K\, Kg\, mole^{-1}$.
→Compound $A$ was treated with a large excess of $CH_3MgBr$. The resulting product was exposed to $POCl_3$ /pyridine to give compound $B$, as one of many products
→Which of the following compounds can be $A$ ?
The activation energy for a reaction at the temperature $T/K$ was found to be $2.303\,RT\, J\, mol^{-1}$. The ratio of the rate constant to Arrhenius factor is
→Consider the cell
→$Pt _{( s )}\left| H _2( g , 1\,atm )\right| H ^{+}( aq , 1 M )|| Fe ^{3+}( aq ), Fe ^{2+}( aq ) \mid Pt ( s )$
When the potential of the cell is $0.712\,V$ at $298\,K$, the ratio $\left[ Fe ^{2+}\right] /\left[ Fe ^{3+}\right]$ is $.......$(Nearest integer)
Given: $Fe ^{3+}+ e ^{-}= Fe ^{2+}, E ^{\circ} Fe ^{3+}, Fe ^{2+} \mid Pt =0.771$
$\frac{2.303 RT }{ F }=0.06\,V$
The most acidic of the following compounds is