JEE Main Previous year questions (2016-20): Alcohols, Phenols & Ethers Notes | EduRev

Chemistry for JEE

JEE : JEE Main Previous year questions (2016-20): Alcohols, Phenols & Ethers Notes | EduRev

The document JEE Main Previous year questions (2016-20): Alcohols, Phenols & Ethers Notes | EduRev is a part of the JEE Course Chemistry for JEE.
All you need of JEE at this link: JEE

Q.1. 1-Methyl ethylene oxide when treated with an excess of HBr produces    (2020)
(1)
(2)
(3)
(4)
Ans.
(2)

The reaction involved is


Q.2. The correct order of stability for the following alkoxides is    (2020)

(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.

Alkoxide (II) is stabilized by –I effect of -NO2 group and –R effect of double bond.

Alkoxide (III) is stabilized by –I effect of -NO2 group and –R effect (long distance conjugation).

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)

(1)
(2)
(3)
(4)
Ans. 
(3)
The reaction involved is


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)

(1)
(2)
(3)
(4)
Ans.
(3)


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)
(2)
(3)
(4)
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.

Thus, the possible structure for I is:

The possible structure for II is:


Q.7. The major product of the following reaction is:    (2019)

(1)
(2)
(3)
(4)
Ans. 
(1)



Q.8. The compounds A and B in the following reaction are, respectively:    (2019)

(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)



Q.9. The major product obtained in the following reaction is:    (2019)

(1)
(2)
(3)
(4)
Ans.
(4)
Reaction involved:


Q.10. The products formed in the reaction of cumene with O2 followed by treatment with dil. HCl are:    (2019)
(1)
(2)
(3)
(4)
Ans.
(3)
Reaction involved:


Q.11. Which is the most suitable reagent for the following transformation?    (2019)

(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).


Q.12. Which of the following compounds reacts with ethyl-magnesium bromide and also decolourizes bromine water solution?    (2019)
(1)
(2)
(3)
(4)
Ans.
(4)


Q.13. The major product in the following conversion is:    (2019)

(1)
(2)
(3)
(4)
Ans. 
(2)


Q.14. The major product of the following reaction is:    (2019)

(1)
(2)
(3)
(4)
Ans. 
(2)


Q.15. The organic compound that gives following qualitative analysis is:    (2019)

(1)
(2)
(3)
(4)
Ans. 
(1)


Q.16. The major product of the following reaction is:    (2019)

(1)
(2)
(3)
(4)
Ans.
(3)



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)
(2)
(3)
(4)
Ans.
(1)
 

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)
(2) 
(3)
(4)
Ans.
(4)


Q.19. The major product formed in the following reaction is:    (2018)

(1)
(2)
(3)
(4)
Ans.
(1)


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) 

(2)
(3)
(4)
Ans. (2)


Q.21. The major product of the following reaction is:    (2018)

(1)
(2)
(3)
(4)
Ans.
(2)


Q.22. The major product of the following reaction is:    (2017)

(1)
(2)
(3)
(4)
Ans.
(1)


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:

The compound I is:    (2017)
(1)
(2)
(3)
(4)
Ans.
(1)


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.

Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Related Searches

JEE Main Previous year questions (2016-20): Alcohols

,

mock tests for examination

,

MCQs

,

practice quizzes

,

Objective type Questions

,

study material

,

Phenols & Ethers Notes | EduRev

,

past year papers

,

Phenols & Ethers Notes | EduRev

,

Previous Year Questions with Solutions

,

Summary

,

Sample Paper

,

Semester Notes

,

video lectures

,

Extra Questions

,

Free

,

Viva Questions

,

Exam

,

shortcuts and tricks

,

ppt

,

JEE Main Previous year questions (2016-20): Alcohols

,

pdf

,

Phenols & Ethers Notes | EduRev

,

Important questions

,

JEE Main Previous year questions (2016-20): Alcohols

;