Aldehydes Keton...

Addition of alcohols to aldehydes in presence of anhydrous acid yield

$$CH_3CONH_2\xrightarrow[]{NaNO_2IHCI}X$$

Addition of alcohols to aldehydes in presence of anhydrous acid yield:

Compound $$(A)$$ is:

Carboxylic acid $$(A)$$ is:

$${CH}_{3}CH=CHCHO$$ is oxidised to $${CH}_{3}CH=CHCOOH$$ using:

Which of the following statements are correct?

The decreasing order of $$ pK_a $$ value of the following is:

Five isomeric p-substituted aromatic compounds (A) to (E) with molecular formula $$C_8H_8O_2$$ are given for identification. Based on the following observation, give the structures of the compounds.
i. Both (A) and (B) form a silver mirror with Tollens reagent. (B) also gives a positive test with neutral $$FeCl_3$$ solution.
ii. (C) gives positive iodoform test.
iii. (D) is readily extracted in aqueous $$NaHCO_3$$ solution.
iv. (E) on acid hydrolysis gives 1,4 - dihydroxy benzene.
Compound (D) is:

Select the correct order in sequence in order to get the final product (E).