Question

Match List - I with List - II. List - I List - II
A. Marquis Test I. Yellow colour
B. Mecke’s Test II. Purple Violet colour
C. Frohde Test III. Deep Green colour
D. Nitric Acid Test IV. Grey Purple colour
Choose the correct answer from the options given below :

• A. A-IV, B-I, C-III, D-II
• B. A-II, B-IV, C-I, D-III
• C. A-I, B-III, C-IV, D-II
• D. A-II, B-III, C-I, D-IV

Hint:

Marquis → purple; Mecke → green; Frohde → yellow; Nitric acid → grey-purple.

Answer 1

The Correct Option is D

Concept: Color tests are widely used in forensic chemistry for the presumptive identification of drugs, especially alkaloids and narcotics.

Step 1: Marquis Test (A).
Marquis reagent produces a purple to violet coloration in presence of opiates such as morphine and heroin.
Thus, A $\rightarrow$ II.

Step 2: Mecke’s Test (B).
Mecke’s reagent gives a deep green color with opiates.
Thus, B $\rightarrow$ III.

Step 3: Frohde Test (C).
Frohde reagent produces a yellow coloration initially, which may darken with time.
Thus, C $\rightarrow$ I.

Step 4: Nitric Acid Test (D).
Nitric acid produces a greyish-purple coloration with certain alkaloids.
Thus, D $\rightarrow$ IV.

Step 5: Final matching.
\[ A-II,\quad B-III,\quad C-I,\quad D-IV \] Final Conclusion:
Hence, the correct answer is option (4).