Question

Match List I with List II and select the correct options

Codes:

• A. a – iv, b – i, c – ii, d – iii
• B. a - iii, b - ii, c - iv, d - i
• C. a – iii, b – ii, c – i, d – iv
• D. a – ii, b – iii, c – iv, d - i

Hint:

It is essential to memorize the common functional group tests in organic chemistry.

• \textbf{Phenols}: Neutral FeCl\(_3\) test (violet color).
• \textbf{Aldehydes}: Tollen's test (silver mirror) or Fehling's test (red ppt).
• \textbf{Alcohols}: Ceric Ammonium Nitrate (red color) or Lucas test (turbidity for 1\(^\circ\), 2\(^\circ\), 3\(^\circ\)).
• \textbf{Primary Aromatic Amines}: Azo dye test (colored dye).

Answer 1

The Correct Option is B

To solve the matching problem, we need to identify which functional group reagent corresponds to each functional group in the given lists. Below are the explanations for each match:

1. Secondary Alcohol and Ceric Ammonium Nitrate Test:

The Ceric Ammonium Nitrate test is used to detect alcohols, including secondary alcohols. It gives a red coloration when alcohols are present, due to the formation of a complex. Thus, secondary alcohol (a) is matched with Ceric Ammonium Nitrate test (iii).

1. C₆H₅NH₂ (Aniline) and Azo Dye Test:

Aniline reacts with nitrous acid to form a diazonium salt, which then can couple with a phenol to form a brightly colored azo dye. This characteristic reaction makes aniline match with the Azo dye test (ii).

1. CH₃CH₂CHO (Propanal) and Tollen’s Reagent Test:

Tollen’s reagent is used to test for aldehydes. Propanal is an aldehyde and will give a positive test by forming a silver mirror. Therefore, Propanal (c) is tested by Tollen’s reagent (iv).

1. Phenol and Neutral Ferric Chloride Test:

Phenol gives a characteristic purple color with neutral ferric chloride due to the formation of a phenolate ion complex. Thus, phenol (d) is matched with the Neutral ferric chloride test (i).

Given the above analyses, the correct matching of List I with List II is: 

List I (Functional group)	List II (Reagent)
(a) Secondary Alcohol	(iii) Ceric Ammonium Nitrate Test
(b) C6H5NH2 (Aniline)	(ii) Azo Dye Test
(c) CH3CH2CHO (Propanal)	(iv) Tollen’s Reagent Test
(d) Phenol	(i) Neutral Ferric Chloride Test

Hence, the correct option is: a – iii, b – ii, c – iv, d – i