In the given reaction,$[X]$ will be:

Among formic acid,acetic acid,propanoic acid and phenol,the strongest acid in water is

Answer the following by appropriately matching the lists based on the information given in the paragraph. List-$I$ includes starting materials and reagents of selected chemical reactions. List-$II$ gives structures of compounds that may be formed as intermediate products and/or final products from the reactions of List-$I$.
$(1)$ Which of the following options has correct combination considering List-$I$ and List-$II$?
$(1) (III), (T), (R)$ $(2) (IV), (Q), (R)$ $(3) (III), (T), (U)$ $(4) (IV), (Q), (U)$
$(2)$ Which of the following options has correct combination considering List-$I$ and List-$II$?
$(1) (I), (Q), (R)$ $(2) (II), (S), (U)$ $(3) (II), (P), (S), (T)$ $(4) (I), (S), (Q), (R)$
Give the answer for question $(1)$ and $(2)$.

The reagent$(s)$ required for the following conversion are:

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 increasing order of acidity of the following carboxylic acids is: