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Practical Organic Chemistry question

2019 · 9 Jan · Shift 1 · Q2
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Practical Organic Chemistry question

2019 · 9 Jan · Shift 1 · Q2

JEE MainChemistryPractical Organic ChemistryMCQ+4 / −1
The correct match between Item-I and Item-II is :

Item-I (drug) Item-II (test)
A Chloroxylenol P Carbylamine test
B Norethindrone Q Sodium hydrogen carbonet test
C Sulphapyridine R Ferric chloride test
D Penicillin S Bayer's test
  1. A
    A →\to→ R; B →\to→ P; C →\to→ S; D →\to→ Q
  2. B
    A →\to→ Q; B →\to→ S; C →\to→ P; D →\to→ R
  3. C
    A →\to→ R; B →\to→ S; C →\to→ P; D →\to→ Q
  4. D
    A →\to→ Q; B →\to→ P; C →\to→ S; D →\to→ R
View written solutionFree

Correct answer: C

  1. Identify the functional group in each drug and match with the characteristic test.
  1. A. Chloroxylenol

Chloroxylenol is a phenolic compound. Phenols give a characteristic ferric chloride test.

Phenol+FeCl3→colored complex\text{Phenol} + \text{FeCl}_3 \rightarrow \text{colored complex}Phenol+FeCl3​→colored complex

So,

A→RA \to RA→R

  1. B. Norethindrone

Norethindrone contains an unsaturated bond (a C=C bond in the steroid framework). Unsaturation is tested by Baeyer's test (alkaline KMnO4\text{KMnO}_4KMnO4​).

So,

B→SB \to SB→S

  1. C. Sulphapyridine

Sulphapyridine is a sulfa drug containing a primary aromatic amino group. Primary amines respond to the carbylamine test.

R−NH2+CHCl3+3KOH→R−NC+3KCl+3H2OR-NH_2 + CHCl_3 + 3KOH \rightarrow R-NC + 3KCl + 3H_2OR−NH2​+CHCl3​+3KOH→R−NC+3KCl+3H2​O

So,

C→PC \to PC→P

  1. D. Penicillin

Penicillin contains a carboxylic acid group. Carboxylic acids give effervescence with sodium hydrogen carbonate test.

RCOOH+NaHCO3→RCOONa+CO2+H2ORCOOH + NaHCO_3 \rightarrow RCOONa + CO_2 + H_2ORCOOH+NaHCO3​→RCOONa+CO2​+H2​O

So,

D→QD \to QD→Q

  1. Final matching

Thus the correct set is:

A→R,  B→S,  C→P,  D→QA \to R,\; B \to S,\; C \to P,\; D \to QA→R,B→S,C→P,D→Q

This corresponds to Option C.

  1. Comparison with stored answer

Stored correct answer = C

Derived answer = C

Hence, the derived answer agrees with the stored answer.

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