3/22/24, 6:27 PM Hydrocarbons - Test

Hydrocarbons - Test

Questions

1. Consider the following statements : A hydrocarbon of molecular formula C5H10 may be

(I) Mono-substituted alkene
(II) di-substituted alkene
(III) tri-substituted alkene
Which of the above statements are correct?
(a) I, II and III
(b) I and II but not III
(c) II and III but not I
(d) I and III but not II

2. 2.8 g of pure alkene containing only one double bond per molecule, reacts completely with 8 g of bromine in
an inert solvent. The molecular formula of alkene is (molar mass of bromine molecule = 160 g/mole)
(a) C2H4
(b) C4H8
(c) C3H4
(d) C6H12

3.

(a)

(b)

(c)

(d)

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4.

The most suitable sequence of reagents to perform this conversion is

(a) HBr then (CH3)3 COK/(CH3)3 C–OH
(b) NBS then alcoholic KOH
(c) HBr–peroxide then CH3CH2OK/CH3CH2OH
(d) HBr–peroxide then (CH3)3COK/(CH3)3COH

5. The compound having only secondary hydrogen atoms is

(a) Isobutene
(b) 2,3-dimethylbut-2-ene
(c) Cyclohexane
(d) Propyne

6. Colouration of Br2/CCl4 will be discharged by

(a)

(b)

(c)

(d)

7. Liquid hydrocarbons can be converted to a mixture of gaseous hydrocarbons by

(a) oxidation
(b) cracking
(c) distillation under reduced pressure
(d) hydrolysis

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8.

A (predominantly) is

(a)

(b)

(c)

(d)

9. The end product in the following reaction is

dilH 2 SO4 Zn−H g/H C l

C H3 − C H2 − C ≡ C H −−−−−−→ A −−−−−−−→ B
+2
Hg ,H 2 O

(a) CH3 – CH2 – CO – CH3

(b) CH3 – CH2 – CH3
(c) CH3 – CH2 – CH2 – CH3

(d)

10. ‘X’ in the following reaction is

Zn/H C l

C2 H 5 C l −−−−−→ X

(a) Ethane
(b) Ethyne
(c) Butane
(d) Propane

11.

An IUPAC name for is

(a) 5-methyl-4-(1-methlpropyl) hexane
(b) 2-methyl-3-(1-methylpropyl)hexane
(c) 2-methyl-3-(2-methylpropyl) hexane.
(d) 3-methyl-4-(1-methylethyl) heptane

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12. Which are the stoichiometric coefficients that complete the following equation?

(a) x = 19/2, y = 6, z = 7

(b) x = 18, y = 12, z = 14

(c) x = 1, y = 1, z = 2
(d) x = 6, y = 6, z = 4

13. Which of the following alkenes have E configuration?

(a) I and II
(b) II and IV
(c) II and III
(d) I and IV

14. Which of the following will react with sodium metal?

(a) Ethene
(b) Propyne
(c) But-2-yne
(d) Ethane

15. The treatment of CH3MgX with C H 3C ≡ C − H produces

(a) CH3 – CH = CH2
(b) C H C H ≡ C − C H
3 3

(c) CH3CH = CHCH3

(d) CH4

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16.
In the following reaction.

What will be the major product?

(a)

(b)

(c)

(d)

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17. A single compound of the structure is obtainable from ozonolysis of which of the following cyclic
compounds?

(a)

(b)

(c)

(d)

18. In the reaction

1.N aN H 2 /liq.N H 3 1.N aN H 2 /liq.N H 3

H − C ≡ C − H −−−−−−−−−−→ X −−−−−−−−−−→ Y
2.C H 3 C H 2 Br 2.C H 3 C H 2 Br

X and Y are
(a) X = 1-butyne; Y = 3-Hexyne
(b) X = 2- butyne; Y = 3-Hexyne
(c) X = 2-butyne; Y = 2-Hexyne
(d) X = 1-butyne; Y = 2-Hexyne

19. Identify the compound ‘A’ in the following sequence –

(a) CH3 − CH2 − C ≡ C − H

(b) CH3 − CH = CH − CH2 − CH3

(c) CH3 − CH2 − CH3

(d) CH2 = CH − CH3

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20. Benzene on reaction with ICl in the presence of Anhydrous AlCl3 gives:

(a)

(b)

(c)

(d)

21. Select the correct reactions along with the corresponding product.

(a)

(b)

(c)

(d) All are correct

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22. What will be the product:

(a) pentane
(b) propane
(c) butane
(d) 2-Methyl propane

23. Consider the following compound

The relative reactivity towards Halonium ion is such that:

(a) I > II > III
(b) II >I > III
(c) II >III> I
(d) III > I > II

24. Which of the following is not true for benzene?

Benzene tends to undergo substitution rather addition reactions, even though it has a high index of
(a)
hydrogen deficiency.
(b) All of the hydrogen atoms of benzene are equivalent.
(c) The carbon-carbon bonds of benzene are alternately short and long around the ring.
(d) Benzene can form three types of disubstituted compounds.

25. Consider the following reaction

Identify the structure of the X

(a)

(b)

(c)

(d)

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26. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating?
(a) -C ≡ N
(b) -SO3H

(c) -Cl

(d) All are equally meta directing.

27.
Nitrobenzene can be prepared from benzene by using a mixture of conc. HNO3 and conc. H2SO4. In the
mixture, nitric acid acts as a/an

(a) reducing agent

(b) acid
(c) base
(d) catalyst

28. In the presence of peroxide, HCI and HI do not give anti-Markovnikov’s rule addition to alkenes because
(a) one of the steps of chain propagation is endothermic in HCl and HI
(b) both HCl and HI are strong acids
(c) HCI is oxidizing and HI is reducing
(d) all the steps are exothermic in HCl and HI.

29. How many structural isomeric compounds are formed on mono-chlorination of 2-methylbutane?
(a) 8
(b) 2
(c) 4
(d) 6

30. Which of the following reaction is used for the test of unsaturation?
(a) Reaction with H2O
(b) Reaction with bromine water
(c) Reaction with alcohol
(d) Reaction with NaHCO3

31. The major organic compound formed by the reaction of 1,1,1-trichloroethane with silver powder is
(a) acetylene
(b) ethane
(c) 2-butyne
(d) 2-butene

32. Hydrocarbons that contain C − C triple bonds are called

(a) cyclo alkanes
(b) Alkanes
(c) Alkenes
(d) Alkynes

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33. Which of the following will be able to distinguish between 1-butyne and 2-butyne?
(a) Na
(b) HCl
(c) O2
(d) Br2

34. When pent-2-yne is treated with H O/H+/Hg2+ the products formed are
2
(a) CH 3 COCH2 CH 2 CH 3
(b) CH3CH2COOCH2CH3
(c) CH3CH2COOH+HCOONa
(d) CH3CH2CH2COOH

35. Alkyl halides react with dialkyl lithium cuprate to give:

(a) Alkenes
(b) Alkyl copper halide
(c) Alkanes
(d) Alkenyl halide

36. General formula for alkenes can be written as _______.

(a) CnH2n
(b) CnH2n+2
(c) C2nH2n+2
(d) CnH2n-2

37. The trans-alkenes are formed by the reduction of But-2-yne with :

(a) Sn-HCl
(b) H2 – Pd/C, BaSO4
(c) NaBH4
(d) Na/liq. NH3

38. The alkene C6H10 producing OHC(CH2)4CHO, on ozonolysis, is

(a) Hexene-1
(b) Hexene-3
(c) Cyclohexene
(d) 1-Methylcyclohexene-1

39. The correct order towards bond length is

(a) C − C < C = C < C ≡ C
(b) C ≡ C < C = C < C − C
(c) C = C < C ≡ C < C − C
(d) C = C < C − C < C ≡ C

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40. Which of the following orders of reactivity are correct for the acid-catalysed hydration of an alkene?

(a)

(b)

(c) CH3–CH = CH2 > CH2 = CH2

(d) All are correct

41. The least reactive towards hydrogenation is

(a)

(b)

(c)

(d) CH2=CH2

42. Potassium salt of 2, 3-dimethyl maleic acid on electrolysis gives

(a) ethyene
(b) propyne
(c) 2-butyne
(d) 1-butyne

43. What is the industrial application of hydrogenation reaction?

(a) Preparing vegetable oils
(b) Preparing vanaspati ghee
(c) Preparing animal fats
(d) None of these

44. Which of the following hydrocarbon undergoes substitution reaction?

C2H2, C2H6, C2H4, C3H6
(a) C2H2
(b) C2H6
(c) C2H4
(d) C3H6

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45. Acetylene can be obtained by the reaction

Electrolysis
(a) H C OOK −−−−−−→
Δ
(b) C H I3 + Ag −
→
Conc. H 2 SO4

(c) C H 3 C H 2 OH −−−−−−−→
443 K

(d) Be 2 C + H 2 O →

46. The oxidation of benzene by V2O5 in the presence of air produces?

(a) Benzoic acid.
(b) Benzaldehyde.
(c) Benzoic anhydride.
(d) Maleic anhydride.

47. Which of the following compounds would be most reactive towards ring nitration?

(a)

(b)

(c)

(d)

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48.
Identify the compound B in the following sequence of reactions.

(a) CH3CH2CHO
(b) CH3COCH3
(c) CH3CH2COCH3
(d) CH3CHO

49. In the commercial gasolines, the type of hydrocarbon which is more desirable is
(a) Branched hydrocarbon
(b) Straight-chain hydrocarbon
(c) Linear unsaturated hydrocarbon
(d) Toluene

50. Which of the following alcohols can’t be prepared from alkene?

(a)

(b)

(c)

(d)

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