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HPCET Substituent Effects — practice questions

Explore 1 free Substituent Effects questions in HPCET Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Substituent Effects questions and exercises with answers

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Order of **acidity** among these substituted phenols: phenol (P), p-nitrophenol (N), p-cresol (C, methyl substituent), p-methoxyphenol (M):Read the answer and worked solution →

Worked practice questions

Order of **acidity** among these substituted phenols: phenol (P), p-nitrophenol (N), p-cresol (C, methyl substituent), p-methoxyphenol (M):

  1. N > P > C > M
  2. N > P > M > C
  3. C > P > N > M
  4. P > N > C > M
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Correct answer: A. N > P > C > M

p-NO₂ is strong −M, −I — stabilises phenoxide (most acidic). p-CH₃ is +I (mildly destabilises phenoxide; weakly basic). p-OMe is +M (lone pair donates into ring) — strongly destabilises phenoxide (least acidic). **So:** p-NO₂ > unsubstituted > p-CH₃ > p-OMe.

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