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Alcohols, Phenols and Ethers WBCHSE Class 12 MCQ & Practice Questions

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Alcohols, Phenols and Ethers Revision Guide for WBCHSE Class 12 Chemistry

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Top 20 Alcohols, Phenols and Ethers MCQs with Answers

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WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

1. Lucas test-এ কোন alcohol তৎক্ষণাৎ turbidity দেয়?

  • A. Methanol
  • B. Ethanol
  • C. 2-propanol
  • D. tert-Butanol
Answer: D
Explanation: Tertiary alcohol দ্রুত carbocation গঠন করে; Lucas reagent-এ তাৎক্ষণিক alkyl chloride তৈরি করে turbidity দেয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

2. Phenol ethanol-এর তুলনায় বেশি acidic কেন?

  • A. phenoxide ion resonance-stabilized
  • B. ethoxide ion বেশি resonance-stabilized
  • C. phenol ionic
  • D. ethanol aromatic
Answer: A
Explanation: Phenoxide ion-এর negative charge resonance দ্বারা delocalized; ethoxide-এ তা হয় না।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

3. Phenol + bromine water-এর প্রধান product কী?

  • A. Bromobenzene
  • B. 2-bromophenol
  • C. 2,4,6-tribromophenol
  • D. 4-bromophenol only
Answer: C
Explanation: Phenolic –OH ring-কে strongly activate করে; bromine water-এ 2,4,6-tribromophenol সাদা precipitate হয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

4. Williamson synthesis-এ anisole প্রস্তুতির উপযুক্ত pair কোনটি?

  • A. C6H5ONa + CH3I
  • B. C6H5Cl + CH3ONa
  • C. C6H6 + CH3OH
  • D. Phenol + CH4
Answer: A
Explanation: Phenoxide ion methyl iodide-এ SN2 attack করে anisole দেয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

5. Primary alcohol-এর controlled oxidation-এ প্রথম product কী?

  • A. Ketone
  • B. Aldehyde
  • C. Acid always
  • D. Ether
Answer: B
Explanation: Primary alcohol প্রথমে aldehyde-এ oxidized হয়; আরও oxidation-এ carboxylic acid।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

6. Secondary alcohol oxidation-এ কী দেয়?

  • A. Aldehyde
  • B. Ketone
  • C. Ether
  • D. Alkene only
Answer: B
Explanation: Secondary alcohol থেকে carbonyl carbon-এ ketone তৈরি হয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

7. Tertiary alcohol mild oxidation-এ সাধারণত কী হয়?

  • A. সহজে aldehyde
  • B. সহজে ketone
  • C. C–C bond না ভাঙলে oxidation কঠিন
  • D. acid directly
Answer: C
Explanation: Tertiary carbon-এ α-H অনুপস্থিত; mild oxidation সহজে হয় না।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

8. Ethanol dehydration at 443 K with conc. H2SO4-এ প্রধান product?

  • A. Diethyl ether
  • B. Ethene
  • C. Ethanal
  • D. Ethanoic acid
Answer: B
Explanation: উচ্চ তাপমাত্রায় intramolecular dehydration প্রধান; ethene তৈরি হয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

9. Ethanol dehydration at ~413 K with conc. H2SO4-এ প্রধান product?

  • A. Ethene
  • B. Diethyl ether
  • C. Ethane
  • D. Acetaldehyde
Answer: B
Explanation: নিম্নতর তাপমাত্রায় intermolecular dehydration-এ diethyl ether তৈরি হয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

10. Phenol-এর Kolbe–Schmitt reaction-এর প্রধান product acidification-এর পরে কী?

  • A. Benzoic acid
  • B. Salicylic acid
  • C. Picric acid
  • D. Anisole
Answer: B
Explanation: Sodium phenoxide + CO2 pressure-এ sodium salicylate; acidification-এ salicylic acid।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

11. Reimer–Tiemann reaction-এ phenol থেকে প্রধান product?

  • A. Benzaldehyde
  • B. Salicylaldehyde
  • C. Benzoic acid
  • D. Anisole
Answer: B
Explanation: CHCl3/NaOH phenol-এর ortho-formylation ঘটিয়ে salicylaldehyde দেয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

12. Anisole + HI (excess, heat)-এ C–O bond কোথায় ভাঙে?

  • A. aryl–O bond
  • B. methyl–O bond
  • C. দুই bond সমান
  • D. কোনোটিই নয়
Answer: B
Explanation: Aryl–O bond-এর partial double character থাকায় cleavage alkyl side-এ SN2 দ্বারা হয়; phenol + CH3I তৈরি হয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

13. Ether-এর boiling point isomeric alcohol-এর তুলনায় কম কেন?

  • A. ether বেশি ionic
  • B. ether molecule নিজের মধ্যে strong H-bond করতে পারে না
  • C. ether heavier
  • D. alcohol nonpolar
Answer: B
Explanation: Alcohol intermolecular hydrogen bonding করে; ether self H-bond donor নয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

14. Methanol বিষক্রিয়ায় প্রধান ক্ষতিকর metabolite কোনটি?

  • A. Methane
  • B. Formic acid
  • C. Acetic acid
  • D. Ethene
Answer: B
Explanation: Methanol → formaldehyde → formic acid; formate optic nerve ও metabolic acidosis-এর জন্য ক্ষতিকর।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

15. Ethanol + Na ধাতুতে কোন gas বের হয়?

  • A. O2
  • B. H2
  • C. CO2
  • D. CH4
Answer: B
Explanation: 2ROH + 2Na → 2RONa + H2↑।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

16. Phenol neutral FeCl3-এর সঙ্গে সাধারণত কোন রঙ দেয়?

  • A. লাল
  • B. বেগুনি/ভায়োলেট
  • C. সবুজ gas
  • D. সাদা
Answer: B
Explanation: Phenolate–Fe(III) complex-এর জন্য characteristic violet coloration দেখা যায়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

17. Phenol nitration dilute HNO3-এ কী দেয়?

  • A. শুধু nitrobenzene
  • B. o- ও p-nitrophenol mixture
  • C. 2,4,6-trinitrophenol only
  • D. benzoic acid
Answer: B
Explanation: Dilute nitric acid-এ electrophilic nitration হয়ে ortho ও para nitrophenol হয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

18. Concentrated HNO3/H2SO4-এর সঙ্গে phenol-এর product?

  • A. Picric acid
  • B. Aniline
  • C. Cyclohexanol
  • D. Benzyl alcohol
Answer: A
Explanation: Strong nitration-এ 2,4,6-trinitrophenol বা picric acid তৈরি হয়।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

19. Alcohol-এর acidic strength সাধারণত কোন ক্রমে?

  • A. 3° > 2° > 1° > CH3OH
  • B. CH3OH > 1° > 2° > 3°
  • C. 1° > CH3OH > 2° > 3°
  • D. সব সমান
Answer: B
Explanation: Alkyl group-এর +I effect alkoxide ion destabilize করে; substitution বাড়লে acidity কমে।

WBCHSE Class 12 Chemistry · Alcohols, Phenols and Ethers · Very Hard

20. tert-Butyl alcohol dehydration-এ প্রধান product?

  • A. But-1-ene
  • B. 2-methylpropene
  • C. Butane
  • D. Butanone
Answer: B
Explanation: Tertiary alcohol dehydration-এ 2-methylpropene তৈরি হয়।

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