11. ALCOHOLS, PHENOLS AND ETHERS Objective

11. ALCOHOLS, PHENOLS AND ETHERS

1. One mole of ethyl acetate on treatment with an excess of LiAlH4 in dry ether and subsequent acidification produces

(A) 1 mole acetic acid + 1 mole ethyl alcohol
(B) 1 mole ethyl alcohol + 1 mole methyl alcohol
(C) 2 moles of ethyl alcohol
(D) 1 mole of 2-butanol

2. Which of the following reagents can not be used to oxidise primary alcohols to aldehydes ?

(A) CrO3 in anhydrous medium
(B) KMnO4 in acidic medium
(C) Pyridinium chlorochromate
(D) Heat in the presence of Cu at 573 K

3. Which of the following alcohols will give the most stable carbocation during dehydration ?

(A) 2-methyl-1-propanol
(B) 2-methyl-2-propanol
(C) 1-Butanol
(D) 2-Butanol

4. Order of esterification of alcohols are

(A) 3° > 1° > 2°
(B) 2° > 3° > 1°
(C) 1° > 2° > 3°
(D) None of these

5. What happens when tertiary butyl alcohol is passed over heated copper at 300°C ?

(A) Secondary butyl alcohol is formed
(B) 2-methylpropene is formed
(C) 1-butene is formed
(D) Butanol is formed

6. (CH₃)₃C – CH₂OH In the reaction, X is

(A) (CH₃)₂C = CHCH₃
(B) CH₃C ≡ CH
(C) (CH₃)₂ CHCH₂CH₃
(D) CH3 – CH2 -C = CH₂
.                         

7. Which of the following alcohols reacts most readily with Lucas reagent ?

(A) CH₃CH₂CH₂OH
(B) CH3 – CH – CH3
.               

.               
(C) CH₃ – C + OH
.             
(D) CH₃ – CH – CH₂ OH
.               

8. Phenol when treated with excess of bromine water gives a white precipitate of

(A) 2, 4, 6-tribromophenol
(B) o-bromophenol
(C) p-bromophenol
(D) bromobenzene

9. Ortho-nitrophenol is less soluble in water than p– and m-nitrophenols because

(A) o-nitrophenol shows intramolecular H-bonding
(B) o-nitrophenol shows intermolecular H-bonding
(C) melting point of o-nitrophenol is lower than those of m– and p-isomers
(D) o-nitrophenol is more volatile in steam than those of m– and p-isomers

10. The best reagent to convert pent-3-en-2-ol into pent-3-en-2-one is

(A) acidic permanganate
(B) acidic dichromate
(C) chromic anhydride in glacial acetic acid
(D) pyridinium chlorochromate

11. Arrange the following alcohols in order of increasing reactivity towards sodium metal.

(i) (CH₃)₃C-OH              (ii) (CH₃)₂ CH-OH                     (iii) CH₃CH₂OH

(A) (iii) < (ii) < (i)
(B) (ii) > (i) < (iii)
(C) (i) < (ii) < (iii)
(D) (iii) < (i) < (ii)

12. Conversion of phenol to salicyclic acid and to salicyaldehyde are known as (respectively)

(A) Reimer-Tiemann reaction and Kolbe’s reaction
(B) Williamson’s synthesis and Hydrobration oxidation
(C) Kolbe’s reaction and Williamson’s synthesis
(D) Kolbe’s reaction and Reimer-Tiemann reaction

13. Benzoquinone is prepared by reaction of phenol with

(A) Na₂Cr₂O₇, H₂ SO₄
(B) KMnO₄, H₂ SO₄
(C) Na₂CrO₄, HCl
(D) K₂MnO₄, H₂SO₄

14. Which of the following is the proper method to prepare n-hexane from n-propyl alcohol ?

CH₃CH₂CH₂OH CH₃CH₂CH₂Br CH₃(CH₂)₄CH₃

(A) (X) → HBr, (Y) → HCN
(B) (X) → HBr, (Y) → Ns, ether
(C) (X) + Br₂, (Y) → CH₃CN
(D) (X) → Br₂, (Y) → KMnO₄

15. An alcohol X on heating with concentrated H₂SO₄ gives an alkene Y which can show geometrical isomerism. The alcohol X is

(A) CH₃CH₂CH(OH)CH₃
(B) (CH₃)₂C(OH)(CH₃)₂
(C) (CH₃)₃ C (OH)
(D) (CH₃)₂ C (OH)CH₂CH₃

16. Methyl alcohol is industrially prepared by the action of

(A) CH₃COCH₃
(B) CO + H₂
(C) CH₃COOH
(D) C₂H₅OH

17. The ether that undergoes electrophilic substitution reaction is

(A) CH₃OC₂H₅
(B) C₆H₅OCH₃
(C) CH₃OCH₃
(D) C₂H₅OC₂H₅

18. How many alcohols with molecular formulae C₄H₁₀O are chiral in nature ?

(A) 1
(B) 2
(C) 3
(D) 4

19. Give IUPAC name of the compound given below:

CH3 – CH – CH2 – CH2 – CH – CH3
.                                        

(A) 2-Chloro-5-hydroxyhexane
(B) 2-Hydroxy-5-chlorohexane
(C) 5-Chlorohexan-2-ol
(D) 2-Chlorohexan-5-ol

20. Phenol is less acidic than

(A) ethanol
(B) o-nitrophenol
(C) o-methylphenol
(D) o-methoxylphenol

21. Which of the following is most acidic ?

(A) Benzyl alcohol
(B) Cyclohexanol
(C) Phenol
(D) m-Chlorophenol

22. Mark the correct order of decreasing acid strength of the following compounds

(A) (V) > (iv) > (ii) > (i) > (iii)
(B) (ii) > (iv) > (i) > (iii) > (v)
(C) (iv) > (v) > (iii) > (ii) > (i)
(D) (v) > (iv) > (iii) > (ii) > (i)

23. The formulae of phenol is

(A) C₆H₅OH
(B) C₂H₅OH
(C) C₃H₄OH
(D) C₆H₆

24. The IUPAC name of CH₃OC₂H₅ is

(A) Methoxy methane
(B) Ethoxy ethane
(C) Ethoxy methane
(D) None

25. The formulae of methanol is

(A) CH₃OH
(B) CH₃ONa
(C) HCHO
(D) CH₄

Class 12th Chemistry Objective Question English