Which one of the following techniques is not used to spot components of a mixture separated on thin layer chromatographic plate?

Question

Canvas Classes · Accepted Answer

Step 1: Understand How TLC Spots are Detected

In TLC, after running the chromatogram, the separated spots are often invisible to the naked eye (colourless compounds). Various techniques are used to visualise the spots:

Step 2: Evaluate Each Detection Technique

(a)  (Solid) — Iodine Staining ✅ (valid method)
- The developed TLC plate is placed in a closed jar containing iodine crystals
- Iodine vapour adsorbs on organic compounds → forms yellow-brown spots
- Non-destructive method

(b) U.V. Li

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