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Class 12 Chemistry MCQ Chapter 11 Alcohols, Phenols and Ethers
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Alcohols, Phenols and Ethers
Chapter: 11
| MCQ |
1. Which functional group characterises aldehydes and ketones?
(i) Hydroxyl.
(ii) Carbonyl.
(iii) Carboxyl.
(iv) Amino.
Ans: (ii) Carbonyl.
2.Which of the following is the correct IUPAC name for the compound CH₃CH₂OH?
(i) Ethanol.
(ii) Ethyl alcohol.
(iii) Ethane-1-ol.
(iv) Both (i) and (iii).
Ans: (iv) Both (i) and (iii).
3. In Williamson’s synthesis, ethoxyethane is prepared by
(i) Passing ethanol over heated Al2O3.
(ii) Heating sodium ethoxide with ethyl bromide.
(iii) Treating ethyl alcohol with excess of H2SO4 at 440 K.
(iv) Heating ethanal with dry Ag2O.
Ans: (ii) Heating sodium ethoxide with ethyl bromide.
4. Which of the following reagents can not, be used to oxidise primary alcohols to aldehydes?
(i) CrO3 in anhydrous medium.
(ii) KMnO4 in acidic medium.
(iii) Pyridinium chlorochromate.
(iv) Heat in the presence of Cu at 573 K.
Ans: (ii) KMnO4 in acidic medium.
5. The reaction which involves dichloro carbene as an electrophile is
(i) Reimer-Tiemann reaction.
(ii) Kolbe’s reaction.
(iii) Friedel-Craft acylation.
(iv) Kolbe-Schmidt reaction.
Ans: (i) Reimer-Tiemann reaction.
6. One mole of ethyl acetate on treatment with an excess of LiAlH4 in dry ether and subsequent acidification produces
(i) 1 mole acetic acid + 1 mole ethyl alcohol.
(ii) 1 mole ethyl alcohol + 1 mole methyl alcohol.
(iii) 2 moles of ethyl alcohol.
(iv) 1 mole of 2-butanol.
Ans: (iii) 2 moles of ethyl alcohol.
7. What is the IUPAC name for methyl propionaldehyde?
(i) 2-Methoxypropanal.
(ii) 3-Methoxypropanal.
(iii) Methoxybutanal.
(iv) 2-Hydroxypropyl aldehyde.
Ans: (i) 2-Methoxypropanal.
8. What type of reaction is used to prepare aldehydes from primary alcohols?
(i) Reduction.
(ii) Dehydrogenation.
(iii) Hydrolysis.
(iv) Ozonolysis.
Ans: (ii) Dehydrogenation.
9. A compound X with the molecular formula C2H8O can be oxidised to another compound Y whose molecular formulae is C3H6O2. The compound X may be
(i) CH3CH2OCH3
(ii) CH3CH2CHO
(iii) CH3CH2CH2OH
(iv) Both (ii) and (iii)
Ans: (iv) Both (ii) and (iii)
10. What is the product of ozonolysis of alkenes followed by reaction with zinc dust and water?
(i) Alkynes.
(ii) Aldehydes.
(iii) Esters.
(iv) Both (ii) and (iv).
Ans: (iv) Both (ii) and (iv).
11. What happens when tertiary butyl alcohol is passed over heated copper at 300°C?
(i) Secondary butyl alcohol is formed.
(ii) 2-methylpropene is formed.
(iii) 1-butene is formed.
(iv) Butanol is formed.
Ans: (ii) 2-methylpropene is formed.
12. The compound which is least soluble in water is:
(i) CH3CH2OH
(ii) CH2 = CH – OCH2CH3
(iii) CH3 – O – CH3
(iv) 2-Methoxy benzoic acid
Ans: (iii) CH3 – O – CH3
13. In the preparation of acetaldehyde from ethyne, which reagent is used?
(i) H2SO4 and HgSO4
(ii) NaBH4
(iii) KMnO4
(iv) DIBAL-H
Ans: (i) H2SO4 and HgSO4
14. What is the common name for the compound CH₃OH?
(i) Ethanol.
(ii) Methanol.
(iii) Propanol.
(iv) Butanol.
Ans: (ii) Methanol.
15. Identify the allylic alcohol from the following compounds:
(i) CH₂=CH–OH
(ii) CH₃–CH₂–OH
(iii) CH₃–CH(OH)–CH₃
(iv) CH₃–C(OH)–CH₂–CH₃
Ans: (i) CH₂=CH–OH
