Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Class 11 Chemistry 35 Years JEE Mains &Advance Past yr Paper

JEE : Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

The document Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev is a part of the JEE Course Class 11 Chemistry 35 Years JEE Mains &Advance Past yr Paper.
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Q.1. Consider the following reactions
(I) (CH3)3CCH(OH)CH3 Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(II) (CH3)3CHCH(Br)CH3 Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(III) (CH3)2CHCH(Br)CH3 Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(IV) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Which of these reaction(s) will not produce Saytzeff product?    (2020)
(1) (I), (III) and (IV)
(2) (IV) only
(3) (III) only
(4) (II) and (IV)
Ans.
(3)
The reaction involved is:
(I)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(II)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(III)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(IV)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Since, the base used in reaction (III) is bulky, so it will abstract the hydrogen from less hindered carbon atom and will not form Saytzeff alkene.

Q.2. Consider the following reactions:
(I) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(II) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(III) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(IV) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Which of these reactions are possible?    (2020)
(1) (I) and (II)
(2) (I) and (IV)
(3) (II), (III) and (IV)
(4) (II) and (IV)
Ans.
(4)
The possible reactions of benzene are:
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Reaction (II):
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Reaction (IV):
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.3. The major products A and B in the following reactions are    (2020)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans. 
(4)
The reaction involved is

Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.4. The major product [B] in the following sequence of reaction is    (2020)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans.
(3)
The reaction involved is
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.5. In the following sequence of reactions, the maximum number of atoms present in molecule ‘C’ in one plane is _______.
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(A is a lowest molecular weight alkyne)    (2020)
Ans. 
(13)
The reaction involved is
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
The molecular formula of toluene is C7H8, thus, the total number of atoms in toluene is 13.

Q.6. The correct order of heat of combustion for following alkadienes is    (2020)
(i) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(ii) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(iii) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev+
(1) (I) < (II) < (III)
(2) (I) < (III) < (II)
(3) (III) < (II) < (I)
(4) (II) < (III) < (I)
Ans.
(1)
We know
Heat of combination of alkene ∝ 1/Stability of alkene
Since, trans-alkene is more stable than the cis-alkenes. Hence, the correct order of heat of combustion of the given dienes is: (I) < (II) < (III).

Q.7. The major product (Y) in the following reactions is    (2020)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans.
(4)
The reaction involved is
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.8. In the following reaction, A is    (2020)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans. 
(1)
The reaction involved is
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.9. The number of sp2 hybrid orbitals in a molecule of benzene is    (2020)
(1) 24
(2) 6
(3) 18
(4) 12
Ans.
(3)
The number of sp2 hybridized orbitals in benzene is 6 × (1 s-orbital + 2 p-orbitals) = 18 orbitals.
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.10. The major product obtained in the following conversion is:    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans:
(1)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.11. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans.
(4)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.12. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans.
(4)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.13. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) CH3CH = C = CH2
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) CH3CH = CHCH2NH2
(4) CH3CH2C ≡ CH
Ans.
(4)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.14. Which one of the following alkenes when treated with HCI yields majorly an anti Markovnikov product?    (2019)
(1) CH3O — CH = CH2 
(2) Cl — CH = CH2 
(3) H2N — CH = CH2 
(4) F3C — CH = CH2
Ans.
(4)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.15. The major product of the following reaction is:    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) CH3CD(I)CHD(Cl)

(2) CH3CD(Cl)CHD(I)
(3) CH3CD2CH(Cl)(I)
(4) CH3C(I)(Cl)CHD2 
Ans.
(4)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Both additions follow Markovnikov’s rule.

Q.16. The major product(s) obtained in the following reaction is/are:    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Ans. (1)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.17. The major product of the following addition reaction is    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans. 
(2)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.18. But 2-ene on reaction with alkaline KMnO4 at elevated temperature followed by acidification will give:    (2019)
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) one molecule of CH3CHO and one molecule of CH3COOH
(3) 2 molecules of CH3COOH
(4) 2 molecules of CH3CHO
Ans.
(3)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.19. Consider the following reaction:    (2019)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
'A' is:
(1) CH ≡ CH
(2) CH3 - C ≡ C - CH3
(3) CH3- C = CH
(4) CH2 = CH2
Ans.
(3)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev 

Q.20. The trans-alkenes are formed by the reduction of alkynes with:    (2018)
(1) H– Pd/C, BaSO4 
(2) NaBH4 
(3) Na/liq. NH3 
(4) Sn-HCl  
Ans.
(3)
Na/Liq. NH3 reduces alkynes into transalkene (trans addition).

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

Q.22. Which of the following compounds will most readily be dehydrated to give alkene under acidic condition?    (2018)
(1) 4-Hydroxypentan-2-one 
(2) 3-Hydroxypentan-2-one 
(3) 1-Pentanol 
(4) 2-Hydroxycyclopentanone 
Ans. 
(1)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev will most readily be dehydrated to give conjugated alkene.

Q.23. Which of the following, upon treatment with tert-BuONa followed by addition of bromine water, fails to decolourize the colour of bromine?    (2017)
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans. (1)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
The above product does not have any C = C or C ≡ C bond, so, it will not give Br2-water test.

Q.24. 3-Methyl-pent-2-ene on reaction with HBr in presence of peroxide forms an addition product. The number of possible stereoisomers for the product is    (2017)
(1) Six
(2) Zero
(3) Two
(4) Four
Ans. (4)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRevPrevious year Questions (2016-20) - Hydrocarbons Notes | EduRev
Since product (X) contains two chiral centres and it is unsymmetrical. 
So, its total stereoisomers = 22 = 4. 

Q.25. Which of the following compounds will not undergo Friedel Craft's reaction with benzene?    (2017)
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans. (1)
Formation of carbocation is not possible in case of CH2 = CHCl

Q.26. The major product of the following reaction is:    (2017)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans. 
(1)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.27. The product of the reaction given below is:    (2016)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans.
(2)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.28. Fluorination of an aromatic ring is easily accomplished by treating a diazonium salt with HBF4. Which of the following conditions is correct about this reaction?    (2016)
(1) Only heat
(2) NaNO2/Cu
(3) Cu2O/H2O
(4) NaF/Cu
Ans. 
(1)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev

Q.29. Bromination of cyclohexene under conditions given below yields:    (2016)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(1) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(2) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(3) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
(4) Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
Ans.
(4)
Previous year Questions (2016-20) - Hydrocarbons Notes | EduRev
It is free radical substitution reaction.

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