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Aldehydes Ketones and Carboxylic Acids question

2019 · 9 Jan · Shift 2 · Q21
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Aldehydes Ketones and Carboxylic Acids question

2019 · 9 Jan · Shift 2 · Q21

JEE MainChemistryAldehydes Ketones and Carboxylic AcidsMCQ+4 / −1
The correct match between Item I and Item II is :

Item - I Item - II
(A) Benzaldehyde (P) Mobile phase
(B) Alumina (Q) Adsorbent
(C) Acetonitrile (R) Adsorbate
  1. A
    (A) →\to→ (Q); (B) →\to→ (P); (C) →\to→ (R)
  2. B
    (A) →\to→ (R); (B) →\to→ (Q); (C) →\to→ (P)
  3. C
    (A) →\to→ (Q); (B) →\to→ (R); (C) →\to→ (P)
  4. D
    (A) →\to→ (P); (B) →\to→ (R); (C) →\to→ (Q)
View written solutionFree

Correct answer: B

  1. Identify each substance in the context of chromatography

    We match the given items:

    • Benzaldehyde
    • Alumina
    • Acetonitrile

    with:

    • Mobile phase
    • Adsorbent
    • Adsorbate

  2. Recall the meanings

    • Adsorbent: the stationary solid surface on which substances get adsorbed.
    • Adsorbate: the substance that gets adsorbed on the surface.
    • Mobile phase: the solvent that moves through the stationary phase.

  3. Match each item

    (A) Benzaldehyde

    • Benzaldehyde is the compound being separated/held on the surface.
    • So it is the adsorbate.

    Hence, A→RA \to RA→R

    (B) Alumina

    • Alumina is commonly used as a stationary phase in chromatography.
    • It acts as the adsorbent.

    Hence, B→QB \to QB→Q

    (C) Acetonitrile

    • Acetonitrile is a solvent commonly used in chromatography.
    • Therefore it is the mobile phase.

    Hence, C→PC \to PC→P

  4. Final matching

    A→R,B→Q,C→PA \to R, \quad B \to Q, \quad C \to PA→R,B→Q,C→P

  5. Check with options

    This corresponds to Option B.

  6. Comparison with stored answer

    Stored correct answer = B

    Our derived answer = B

    So, the answer agrees with the stored answer.

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