Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Chemistry Class 12

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Q.1. 1-Methyl ethylene oxide when treated with an excess of HBr produces    (2020)
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(2)

The reaction involved is
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.2. The correct order of stability for the following alkoxides is    (2020)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) (II) > (I) > (III)
(2) (III) > (II) > (I)
(3) (III) > (I) > (II)
(4) (II) > (III) > (I)
Ans.
(2)
The stability of the following alkoxides depends upon the dispersion of the negative charge on oxygen atom in the molecule.
Alkoxide (I) is stabilized by –I effect of -NO2 group.
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Alkoxide (II) is stabilized by –I effect of -NO2 group and –R effect of double bond.
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Alkoxide (III) is stabilized by –I effect of -NO2 group and –R effect (long distance conjugation).
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Thus, the correct order of stability of alkoxide is: (III) > (II) > (I).

Q.3. In the following reaction sequence, structures of A and B, respectively will be    (2020)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans. 
(3)
The reaction involved is
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.4. Arrange the following compounds in increasing order of C–OH bond length; methanol, phenol, pethoxyphenol    (2020)
(1) Methanol < p-ethoxyphenol < phenol
(2) Phenol < methanol < p-ethoxyphenol
(3) Phenol < p-ethoxyphenol < methanol
(4) Methanol < phenol < p-ethoxyphenol
Ans.
(3)
Due to the delocalization of lone pair electrons of oxygen into the benzene ring, thus, the C-OH bond in phenol have partial double bond character. In p-ethoxyphenol, the lone pair of electrons also delocalized in the ring but due to the presence of ethyl group attached to oxygen atom, so, the C-OH bond in pethoxyphenol have less than partial double bond character. In methanol, the bond between C-OH have single bond. Hence, the increasing order of C-OH bond is: phenol < p-ethoxyphenol < methanol.

Q.5. The major product of the following reaction is   (2020)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(3)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.6. Among the compounds A and B with molecular formula C9H18O3, A is having higher boiling point the B. The possible structures of A and B are    (2020)
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(1)
The compound that will show more hydrogen bonding will have high boiling point. Compound (I) have higher boiling point than compound (II), because compound (I) show hydrogen bonding.
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Thus, the possible structure for I is:
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
The possible structure for II is:
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.7. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans. 
(1)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.8. The compounds A and B in the following reaction are, respectively:    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) A = Benzyl alcohol, B = Benzyl cyanide
(2) A =Benzyl chloride, B = Benzyl cyanide
(3) A = Benzyl alcohol, B = Benzyl isocyanide
(4) A = Benzyl chloride, B = Benzyl isocyanide
Ans.
(4)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.9. The major product obtained in the following reaction is:    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(4)
Reaction involved:
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.10. The products formed in the reaction of cumene with O2 followed by treatment with dil. HCl are:    (2019)
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(3)
Reaction involved:
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.11. Which is the most suitable reagent for the following transformation?    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Tollen’s reagent
(2) I2/NaOH
(3) CrO2Cl2/CS2
(4) alkaline KMnO4
Ans.
(2)
The most suitable reagent for the given reaction is I2/NaOH (Iodoform reaction).
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.12. Which of the following compounds reacts with ethyl-magnesium bromide and also decolourizes bromine water solution?    (2019)
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(4)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.13. The major product in the following conversion is:    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans. 
(2)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.14. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans. 
(2)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.15. The organic compound that gives following qualitative analysis is:    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans. 
(1)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.16. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(3)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.17. What will be the major product when m-cresol is reacted with propargyl bromide (HC ≡ C — CH2Br) in presence of K2CO3 in acetone?    (2019)
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(1)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev 

Q.18. Phenol reacts with methyl chloroformate in the presence of NaOH to form product A. A reacts with Br2 to form product B. A and B are respectively:    (2018)
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(4)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.19. The major product formed in the following reaction is:    (2018)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(1)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.20. Phenol on treatment with CO2 in the presence of NaOH followed by acidification produces compound X as the major product. X on treatment with (CH3CO)2O in the presence of catalytic amount of H2SO4 produces:    (2018)
(1) 
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans. (2)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.21. The major product of the following reaction is:    (2018)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(2)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.22. The major product of the following reaction is:    (2017)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(1)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.23. The increasing order of the boiling points for the following compounds is:    (2017)
(i) C2H5OH
(ii) C2H5Cl
(iii) C2H5CH3
(iv) C2H5OCH3
(1) (IV) < (III) < (I) < (II)
(2) (III) < (II) < (I) < (IV)
(3) (III) < (IV) < (II) < (I)
(4) (II) < (III) < (IV) < (I)
Ans.
(3)
B.P. ∝ dipole moment∝ H-bonding
C2H5CH3 < C2H5OCH3 < C2H5Cl < C2H5OH

Q.24. In the following reaction sequence:
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
The compound I is:    (2017)
(1) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(2) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(3) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
(4) Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev
Ans.
(1)
Previous year Questions (2016-20) - Alcohols, Phenols and Ethers Notes | EduRev

Q.25. The gas evolved on heating CH3MgBr in methanol is:    (2016)
(1) Propane
(2) Ethane
(3) HBr
(4) Methane
Ans.
(4)
CH3MgBr + CH3–OH → (CH3O)MgBr + CH4↑ gas.

Q.26. Bouveault-Blanc reduction reaction involves:    (2016)
(1) Reduction of an anhydride with LiAlH4.
(2)  Reduction of an ester with Na/C2H5OH.
(3) Reduction of a carbonyl compound with Na/Hg and HCl
(4)  Reduction of an acyl halide with H2/Pd.
Ans. 
(2)
Reduction using Na in ethylalcohol is called Bouveault-Blanc reduction.

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