What is the correct order of acidic strength for the following compounds: $(a)$ Phenol,$(b)$ $p$-methylphenol,$(c)$ $p$-methylbenzoic acid,and $(d)$ Benzoic acid?

The correct order of acid strength of the following carboxylic acids is $-$

Which of the following compounds evolves $2 \ mole$ of $CO_2$ on gentle heating?

Which of the following reactions produce carboxylic acids?
$(a)$ $MnO_2$ with $CH_3COCH_3$
$(b)$ $Ph-CCl_3 \xrightarrow[(ii) H_2O/H^+]{(i) aq. NaOH} PhCOOH$
$(c)$ $C_2H_5Br \xrightarrow[(iii) H_2O/H^+]{(i) Mg, (ii) CO_2} C_2H_5COOH$
$(d)$ $CH_3CH=CHCH_3 \xrightarrow[\Delta]{K_2Cr_2O_7/H_2SO_4} 2CH_3COOH$

Identify the final product $(D)$ in the following reaction sequence:
Phthalic anhydride $\xrightarrow{PCl_5} (A)$ $\xrightarrow{LiAlH_4} (B)$ $\xrightarrow{PCC} (C)$ $\xrightarrow{HO^-, \Delta} (D)$

Match the following.

List-$I$ (Substance)	List-$II$ (Use)
$(A)$ Methanoic acid	$(i)$ Textile
$(B)$ Ethanoic acid	$(iv)$ Vinegar
$(C)$ Hexanedioic acid	$(ii)$ Polymer
$(D)$ Sodium benzoate	$(iii)$ Food preservative