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Basics of Organic Chemistry question

2022 · 28 Jul · Shift 2 · Q11
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Basics of Organic Chemistry question

2022 · 28 Jul · Shift 2 · Q11

JEE MainChemistryBasics of Organic ChemistryMCQ+4 / −1
Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R Assertion A : Thin layer chromatography is an adsorption chromatography. Reason R : A thin layer of silica gel is spread over a glass plate of suitable size in thin layer chromatography which acts as an adsorbent. In the light of the above statements, choose the correct answer from the options given below
  1. A
    Both A and R are true and R is the correct explanation of A
  2. B
    Both A and R are true but R is NOT the correct explanation of A
  3. C
    A is true but R is false
  4. D
    A is false but R is true
View written solutionFree

Correct answer: A

  1. Understand the assertion
    Assertion A says: Thin layer chromatography (TLC) is an adsorption chromatography.

    In TLC, the stationary phase is usually silica gel or alumina, which are solid adsorbents. The components of the mixture get separated due to different extents of adsorption on this stationary phase.
    Therefore, Assertion A is true.

  2. Understand the reason
    Reason R says: A thin layer of silica gel is spread over a glass plate of suitable size in TLC which acts as an adsorbent.

    This is correct. In TLC, a thin layer of silica gel is indeed coated on a glass/plastic/aluminium plate, and silica gel acts as the adsorbent.
    Therefore, Reason R is true.

  3. Check whether R explains A
    TLC is called adsorption chromatography precisely because the stationary phase used is a solid adsorbent like silica gel. Since the reason states that silica gel is spread over the plate and acts as an adsorbent, it directly explains why TLC is an adsorption chromatography.

  4. Conclusion

    • A is true
    • R is true
    • R is the correct explanation of A

Hence, the correct option is A.

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