Chemistry MCQs for Class 12 with Answers Chapter 11 Alcohols, Phenols and Ethers

MCQs Based On Class 12 Chemistry Chapter 11 Alcohols, Phenols and Ethers

MCQ Questions for Class 12 Chemistry are prepared by the subjects experts according to the latest pattern. These MCQs are very important for students who wants to score well in CBSE Board Exam. These MCQs on chapter 11 Alcohols, Phenols and Ethers will also help students in understanding the concepts very well.

Q.1. The compound which reacts fastest with Lucas reagent at room temperature is
(a) Butan-1-ol
(b) Butan-2-ol
(c) 2-Methyl propan-1-ol
(d) 2-Methylpropan-2-ol

Answer

Answer: (d)

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Q.2. In the reduction
R — CHO + H₂ → RCH₂OH
the catalyst used is :
(a) Ni
(b) Pd
(c) Pt
(d) Any of these

Answer

Answer: (d) Any one of Ni, Pt or Pd can be used in the reduction of aldehydes.

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Q.3. Acid catalyzed hydration of alkenes except ethene leads to the formation of
(a) primary alcohol
(b) secondary or tertiary alcohol
(c) mixture of primary and secondary alcohols
(d) mixture of secondary and tertiary alcohols

Answer

Answer: (b)

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Q.4. Ethyl alcohol can be prepared from Grignard reagent by the reaction of :
(a) HCHO
(b) R₂CO
(c) RCN
(d) RCOCl

Answer

Answer: (a)

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Q.5. Isopropyl alcohol is obtained by reacting which of the following alkenes with concentrated H₂SO₄ followed by boiling with H₂O?
(a) Ethylene
(b) Propylene
(c) 2-Methylpropene
(d) Isoprene

Answer

Answer: (b)

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Q.6. Ethylene reacts with Baeyer’s reagent to give
(a) ethane
(b) ethyl alcohol
(c) ethylene glycol
(d) None of these

Answer

Answer: (c)

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Q.7. Ethyl alcohol is industrially prepared from ethylene by
(a) Permanganate oxidation
(b) Catalytic reduction
(c) Absorbing in H2SO4 followed by hydrolysis
(d) All the three

Answer

Answer: (c)

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Q.8. Sodium salt of benzene sulphonic acid on fusion with caustic soda gives
(a) Benzene
(b) Phenol
(c) Thiophenol
(d) Benzoic acid

Answer

Answer: (b)

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Q.9. Alkenes convert into alcohols by
(a) hydrolysis by dil. H₂SO₄
(b) hydration of alkene by alkaline KMnO₄
(c) hydrolysis by water vapours and conc. HNO₃
(d) hydration of alkene by aqueous KOH

Answer

Answer: (b)

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Q.10. Which of the following reacts with NaOH to give an alcohol?
(a) Propene
(b) Butene
(c) Ethanal
(d) Methanal

Answer

Answer: (d)

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Q.11. By which of the following methods alcohol can be prepared in excellent yield?
(a) From alkenes
(b) By hydroboration-oxidation
(c) From carbonyl compounds
(d) From Grignard reagent

Answer

Answer: (b)

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Q.12. Which of the following compounds is oxidised to prepare methyl ethyl ketone?
(a) 2-Propanol
(b) l-Butanol
(c) 2-Butanol
(d) t-Butyl alcohol

Answer

Answer: (c)

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Q.13. HBr reacts fastest with
(a) 2-Mehtylpropan-1-ol
(b) 2-Methylpropene-2-ol
(c) propan-2-ol
(d) propan-1-ol

Answer

Answer: (b) Greater the stability of the intermediate carbocation, more reactive is the alcohol. Since 2-methylpropan-2-ol generates 3° carbocation, therefore, it reacts fastest with HBr.

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Q.14. n-Propyl alcohol and isopropyl alcohol can be chemically distinguished by which reagent?
(a) PCl₅
(b) Reduction
(c) Oxidation with potassium dichromate
(d) Ozonolysis

Answer

Answer: (c) Primary alcohol on oxidation give aldehyde which on further oxidation give carboxylic acid whereas secondary alcohols give ketone.

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Q.15. Lucas reagent is
(a) Conc. HCl and anhydrous ZnCl₂
(b) Conc. HNO₃ and hydrous ZnCl₂
(c) Conc. HCl and hydrous ZnCl₂
(d) Conc. HNO₃ and anhydrous ZnCl₂

Answer

Answer: (a)

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