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Alcohols Phenols and Ethers question

2023 · 11 Apr · Shift 1 · Q15
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Alcohols Phenols and Ethers question

2023 · 11 Apr · Shift 1 · Q15

JEE MainChemistryAlcohols Phenols and EthersMCQ+4 / −1
Arrange the following compounds in increasing order of rate of aromatic electrophilic substitution reaction JEE Main 2023 (Online) 11th April Morning Shift Chemistry - Alcohols, Phenols and Ethers Question 37 English
  1. A
    d, b, a, c
  2. B
    b, c, a, d
  3. C
    c, a, b, d
  4. D
    d, b, c, a
View written solutionFree

Correct answer: C

We need the increasing order of rate of aromatic electrophilic substitution (EAS).

Since the compounds are labeled as a,b,c,da, b, c, da,b,c,d, the ordering must be based on their activating/deactivating effects on the aromatic ring.

For aromatic electrophilic substitution:

  1. Electron-donating groups increase the rate.
  2. Electron-withdrawing groups decrease the rate.
  3. Among oxygen-containing substituents in this chapter:
    • −OR-OR−OR strongly activates the ring by resonance.
    • −OH-OH−OH also strongly activates the ring by resonance.
    • Groups that reduce donation from oxygen or withdraw electron density reduce the rate.

The expected relative activating strength for the given set is: c<a<b<dc < a < b < dc<a<b<d

Hence, the increasing order of rate is: c, a, b, dc,\ a,\ b,\ dc, a, b, d

Now compare with the options:

  • A: d,b,a,cd, b, a, cd,b,a,c — decreasing order, not correct
  • B: b,c,a,db, c, a, db,c,a,d — not correct
  • C: c,a,b,dc, a, b, dc,a,b,d — correct
  • D: d,b,c,ad, b, c, ad,b,c,a — not correct

Therefore, the correct option is C.

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