Hydrocarbons MCQs – 6

1) Which of the following is the strongest o, p-directing group ?
a) -OH
b) -Cl
c)
d)

2) Which of the following is the most reactive towards ring nitration ?
a) o-Xylene
b) Toluene
c) p-Xylene
d) m-Xylene.

3) One mole of a hydrocarbon having molecular weight 78 is subjected to ozonolysis and the H2O2 formed in the reaction is not removed from the site of reaction. The product obtained on treatment with Ca2+ ions gave 384 g of calcium oxalate. The hydrocarbon is
a)
b)
c)
d) Benzene.

4) Which of the following statements is/are incorrect ?
a) Bromination of p-nitrotoluene in presence of iron gives 2- bromo-4-nitrotoluene
b) Nitration of m-xylene gives 2, 4-dimethyl-1-nitrobenzene
c) Sulphonation of p-tert-butyltoluene gives 5-tert-butyl-2-methyl-1-benzenesulphonic acid
d) The Friedel-Crafts reaction of benzene with sec-butyl bromide predominantly gives isobutyl- benzene.

5) Arrange the following compounds in increasing order of acidity
CH CH, CH2 = CH2, CICH2CH3, FCH2CH3, CH3CH3
a)
b)
c)
d)

6) Which of the following is used in Friedel-Crafts acylation reaction ?
a) alone
b) alone
c) alone
d) Both (a) and (b)

7) Which of the following is a primary alkyl halide ?
a)
b)
c)
d)

8) The IUPAC name of tert-butyl chloride is
a) 1, 1-Dimethylethyl chloride
b) 1-Chloro-2-methylpropane
c) 2-Chlorobutane
d) 2-Chloro-2-methylpropane.

9) The IUPAC name of CH2 = CHCH2CI is
a) Allyl chloride
b) 1-Chloroprop-3-ene
c) 3-Chloro-1 -propene
d) 3-Chloropropylene.

10) What is the IUPAC name of -phenylethyl bromide?
a) 2-Bromo-1-phenylethane
b) 1-Bromo-2-phenylethane
c) 2-Bromo-1 -phenylethylene
d) 2-Bromo-2- phenylethylene

11) The IUPAC name of CH3CHCICHBrCH2CH3 is
a) 3-Bromo-2-chloropentane
b) 3-Bromo-4-chloropentane
c) 1 -Bromo-1 -ethyl-2-chloropropane
d) 1 -Chloro-1 -methyl-2-bromobutane.

12) Groves method is used for the preparation of
a)
b)
c)
d)

13) The IUPAC name of BHC is
a) Benzene hexachIoride
b) Hexachlorobenzene
c) 1,1, 3, 3, 5, 5-Hexachlorocyclohexane
d) 1, 2, 3, 4, 5, 6-Hexachlorocyclohexane.

14) When chloroform reacts with nitric acid, it gives
a)
b)
c)
d)

15) Which of the following compounds will give the haloform test ?
a) alone
b) alone
c) alone
d) All of the above.

16) The final product of the following sequence reactions is
a)
b)
c)
d)

17) A keto ester (A) with the M.F. C6H1003 on treatment with NaOH + I2 does not give iodoform but on boiling with dilute KOH gives a compound (B) with the M.F. C4H5O3K which upon acidification followed by heating undergoes decarboxylation to give acetone. The keto ester (A) is
a)
b)
c)
d)

18) The rose odor comes from an ester formed by formic acid and
a) Pine oil
b) Olive oil
c) Grain oil
d) Turpentine oil

19) Saccharine contains
a) Carbon and hydrogen only
b) Carbon, hydrogen, oxygen, and nitrogen
c) Carbon, hydrogen, oxygen, nitrogen and sulphides
d) Carbon and oxygen only

20)
a) HCHO
b) HCOOH
c) CH3OH
d)

21)
a) HCHO
b) HCOOH
c) CH3OH
d)

22) The cracking of heavy petroleum fractions is catalysed by
a) Silica, Alumina gel
b) Aluminium sulphate
c) Aluminium chloride
d) Platinum

23) A non – combustible solvent is
a) C2H5OH
b) C2H5O C2H5
c) CCl 4
d) Turpentine

24) The correct IUPAC name of ( CH3 )3 C . COOH is
a) 2, 2, – Dimethyl acetic acid
b) 2, 2 – Dimethyl propanoic acid
c) 2, 2  – Dimethyl ethanoic acid
d) None of these

25) The IUPAC name of Acrolein is
a) Prop – 2 – en – 1 – al
b) Prop – 1 – en – 2 – al
c) 1 – Propanol
d) None of these

26) Allyl alcohol is named according to IUPAC rules as
a) Prop – 3 – en – 1 – ol
b) Prop – 2 – en – 1 – ol
c) Prop – 1 – en – 1 – ol
d) None of these

27) Crotonaldehyde is named according to IUPAC rules as
a) But – 2 – en – 1- al
b) But – 3 – en – 1 – al
c) But – 2 – yn – 1 – al
d) Buthanal

28) The IUPAC name of acrylonitrile is
a) 2 – propen – 1 – nitrile
b) 2 – propen – 2 – nitrile
c) Propane nitrile
d) None of these

29) The IUPAC name for orthoxylene is
a) 1, 2 – Dimethyl benzene
b) 1, 3 – Dimethyl benzene
c) 1, 4 – Dimethyl benzene
d) All of these

30) The correct IUPAC name for symmetrical trimethyl benzene is
a) 1, 2, 3 – Trimethyl benzene
b) 1, 3, 5 – Trimethyl benzene
c) 2, 3, 4 – Trimethyl benzene
d) 2, 4 ,6 – Trimethyl benzene

31) The IUPAC name of tartaric acid is
a) Butanedoic acid
b) 2 – Hydroxy butanoic acid
c) 2, 3 – Dihydroxy butanodic acid
d) 2, 3 – Butane diol – 1, 4 – dioic acid

32) Who prepared the first organic compound in the laboratory?
a) G . March
b) Fucher
c) Wohler
d) J. D. Lee

33) The self linking property of carbon atoms to form long chains is called
a) Electronegativity
b) Catenation
c) Conductivity
d) None of these

34) The alkane which has only primary hydrogen atoms is
a) Pentane
b) Isopentane
c) Neopentane
d) 2, 2 – Demethylbutane

35) is
a) 3 – Ethyl – 2 – methyl hexane
b) 4 – Ethyl – 5 – methyl hexane
c) 2 – Methyl – 3 – ethyl hexane
d) None of these

36) The correct IUPAC name of cinnamic acid is
a) 2 – Phenyl – 2 – propenoic acid
b) 2 – Methyl – 2 – propenoic acid
c) 3 – Phenyl – 2 – propenoic acid
d) None of these

37) is
a) Propanetriol
b) Tripropanol
c) 1, 2, 3 – Tripopanal
d) 1, 2, 3 – Propanetriol

38) Planar carbocations are formed by
a) CH4
b) C2H6
c) CH4 and  C2 H6
d) None of these

39) The more stable conformation of Butane is
a) Ante
b) Skew
c) Eclipsed
d) Meso

40) Carbonium ions are formed by
a) C2 H5 OH / H+
b) C2H2  / OH
c) C6 H6 / Cl2, UV light
d) C2 H5 OH / H+ and  C2H2  / OH

41)
a) 2 – Methyl – 2 – butene
b) 2 – Methyl – 1 – butene
c) Isobutene
d) 2 – Methyl – 2 – pentene

42)
a) 2 – Allyl – 1 – butanol
b) 2 – Ethyl prop – 1 – en – 2 – ol
c) 2 – Ethyl prop – 2 – en – 1 – ol
d) None of these

43)
a) 2 – Bromo – 3 – chloro – 4 – iodo hexane
b) 2 – Bromo – 4 – iodo – 3 – chloro hexane
c) 5 – Bromo – 4 – chloro – 3 – iodo hexane
d) All of these

44) is
a) 2 – pentanol – 4 – ene
b) 4 – Methyl – 1 – pentanol
c) 4 – pentenol – 2 – o l
d) 5 – Hydroxy pentene

45)
a) 4 – Ethyl pent – 2 – ene
b) 1 – Ethyl – 3 – methyl but – 2 – ene
c) 3 – Methyl hex – 4 – en – 1 – yne
d) 4 – Methyl hex  – 2 – en –  5  – yne

46) The structure of Hex -2 , 4 – dien -1, 6 – dioic acid is
a) HOOC – CH  =  CH – CH = CH – COOH
b) HOOC – CH2 – CH = C = CH – COOH
c) HOOC – CH = CH – CH = CH – CHOOH and HOOC – CH2 – CH = C = CH – COOH
d) None of these

47) The IUPAC name for the compound

CH3 – CH2 – NH – CH2 is
a) Diethyl amine
b) N- Ethylethanamine
c) Diethyl amine and N – Ethylethanamine
d) None of these

48) The systematic name for the compound CH3 – CH2 – CN is
a) Ethyl cyanide
b) Ethane nitrile
c) Propane nitrile
d) None of these

49) The correct IUPAC name of ( C2 H5 ) 4 C is
a) Tetraethyl methane
b) 2 – Ethylpentane
c) 3, 3 – Diethyl pentane
d) None of these

50) 

a) 2 – Methylpentan – 2 , 4 – diol
b) 4 – Methylpentan – 2 , 4 – diol
c) 2 – Methyl – 4 – hydroxyl – 2 – pentanol
d) 2, 4 Denethyl butan – 2,  4 – diol

51) The correct IUPAC name  of  ( C6 H5 ) 4 C is
a) Neophenyl
b) Quarternary phenyl
c) 3, 3  – Diphenyl dodecane
d) Tetraphenyl methane

52) The IUPAC name of HOOC – CH = CH – CH = CH – COOH is
a) Hex – 2, 4 – dien – 1, 6 – dioic acid
b) 2, 4 – dihexene – 1, 6 – dioic acid
c) Hex – 2, 4 – dien -1, 6 – oic acid
d) All of these

53) The most stable carbocations are formed by
a) CH3 – CH = CH2
b) NH2 – CH = CH2
c) Cl – CH = CH2
d) C6 H5 – CH – CH2

54) Which of the following has the most acidic nature?
a) Allyl alcohol
b) Vinyl alcohol
c) Ethanol
d) None of these

55) The strength of an acid or a base depends on its
a) Inductive effect
b) Steric effect
c) Inductive effect and Steric effect
d) None of these

56) The carbon carbon bond length in a saturated aliphatic compound is
a) 33 A¦

b) 54 A¦

c) 39 A¦

d) 45 A¦

57) An acetylene molecule contains
a) 4 sigma and 1 pi bond
b) 5 sigma bonds
c) 3 sigma and 2 pi bonds
d) 2 sigma and 3 pi bonds

58)  The number of different amines corresponding to the formula C3H9 N is
a) 3
b) 3
c) 4
d) 5

59) The rotation of plane polarised light can be measured by a
a) Manometer
b) Galvanometer
c) Polarimeter
d) Viscometer

60) Optically active isomers but not mirror https://www.hourlybook.com/wp-content/uploads/engg-chemistry/Images are called
a) Entantiomers
b) Mesomers
c) Tautomers
d) Diastereoisomers

61) A compound contains two dissimilar asymmetrical C – atoms. The number of optical isomers is
a) 2
b) 3
c) 4
d) 5

62) Meso-tartaric acid is optically inactive due to the presence of
a) Molecular symmetry
b) Molecular asymmetry
c) External compensation
d) Two asymmetric C – atoms

63) Optical isomers are called
a) Epimers
b) Anomers
c) Coformors
d) Enantiomers

64) The extent of rotation of plane polarised light depends on the
a) Nature of light
b) Number of molecules
c) Number of asymmetric carbon atoms
d) Specific rotation

65) Stereoisomers that are not mirror https://www.hourlybook.com/wp-content/uploads/engg-chemistry/Images of each others are called
a) Mesomers
b) Optical antipodes
c) Enantomorphs
d) Diastereomers

66) Geometrical isomerism is possible in the case of
a) 2 – Butene
b) Ethene
c) Propane
d) Propene

67) The molecular formula of a saturated compound is C2 H4 Cl2. This formula permits the existence of two
a) Functional isomers
b) Position isomers
c) Optical isomers
d) Cis- trans isomers

68) The boiling point of ethanol is higher than that of demethyl ether due to the presence of the
a) Hydrogen bonding in demethyl ether
b) Ethyl group in ethanol
c) Methyl group in demethyl ether
d) Intermolecular hydrogen bonding in ethanol

69) The number of  p electrons in a benzene molecule is

a) 3 x 2
b) 23
c) 3 x 3
d) 32

70) How many isomeric forms of hexane ( C6 H14 ) are optically active?
a) Six
b) Five
c) Three
d) Zero

71) The no of monobromo derivatives of neopentane is
a) Five
b) Four
c) One
d) More than Five

72) A compound contains one dissimilar asymmetric carbon atom. The number of optical isomers is
a) 2
b) 3
c) 4
d) 5

73) How many conformations does ethane show?
a) 2
b) 3
c) 5
d) 4

74) The shape of the carbonium ion is
a) Trigonal planar
b) V-shaped
c) Pyramidal
d) None of these

75) On heating calcium acetate and calcium formate the product formed is
a) HCHO
b) CH3 CHO
c) HCHO + CaCO3 <
d) 
CH3 CHO + CaCO3

76) 2, 2 – Dichloro propane on hydrolysis with NaOH gives
a) CH3CH2CHO
b) CH3COCH3
c) CH3CH2CH2OH
d) C2H5OH

77) On heating sodium metal in a current of dry ammonia gas the compound formed is
a) Sodium nitrite
b) Sodium hydride
c) Sodium amide
d) Sodium nitrate

78) Boiling C6H5CH2Cl with aqueous Ph ( NO3 )2 in a current of CO2 gives
a) C6H5COCl
b) C6H5COOH
c) C6H5CHO
d) C6H5CH2Cl

79) Magenta is
a) Alkaline phenolphthalein
b) Methyl red
c) Rosaniline hydrochloride
d) Quinoline

80) Halogenation of paraffin is a / an
a) Oxidation reaction
b) Reduction reaction
c) Substitution reaction
d) Elimination reaction

81) n – propyl magnesium bromide on treatment with ethyl alcohol gives
a) CH4
b) C2 H14
c) C3 H8
d) C2 H4

82) An aqueous solution of a substance gives ethane on electrolysis. The substance is
a) Cetric acid
b) Butyric acid
c) Ethyl acetate
d) Potassium acetate

83) A more easily replaceable halogen is present in
a) C6 H5 Cl
b) C6 H11 Cl
c) CH2 = CH – Cl
d) None of these

84) Boiling point is higher in the case of
a) C6 H6
b) C6 H14
c) C4 H10
d) C3 H8

85) Cracking of alkanes involves
a) Free radicals
b) Carbonium ions
c) Carbanions
d) Carbenes

86) 1 – Butyne on treatment with dilute HCl and Hg Cl2 at 100 deg C forms
a) Butanone
b) Butanol
c) Butanal
d) None of these

87) The compound with the highest boiling point is
a) n – Hexane
b) n – Decane
c) Hexanoic acid
d) 2, 2 – Di methyl propane

88) Petroleum mainly contains
a) Aliphatic hydrocarbons
b) Aromatic hydrocarbons
c) Aliphatic alcohols
d) None of these

89) CH4 reacts with Cl2 in presence of sunlight. Which of the following compounds is not formed?
a) CH Cl3
b) CH2 Cl2
c) CH3 Cl
d) C2 H4

90) An octane number of 124 is given to
a) 2, 3, 4 – Trimethyl pentane
b) 2, 2, 4 – Trimethyl pentane
c) 2, 2, 3 – Trimethyl butane
d) 2, 2, 3 – Trimethyl pentane

91) Hexadecane has a cetane number of
a) 100
b) 120
c) 124
d) Zero

92) The fractional distillation of coal – tar produces the following fractions. Of which fraction is phenol the main component?
a) Light oil
b) Middle oil
c) Heavy oil
d) Green oil

93) A mixture of ethyl iodide an n – propyl iodide is subjected to the Wurtz reaction. The hydrocarbon which will not be formed is
a) Butane
b) Propane
c) Pentane
d) Hexane

94) Dehydration of ethanol with conc. H2SO4 gives
a) Acetic acid
b) Ethane
c) Ethylene
d) Acetylene

95) n- propyl bromide on treatment with ethanolic potassium hydroxide produces
a) Propane
b) Propene
c) Propyne
d) Propanol

96) The presence of peroxide affects the addition of
a) HBr
b) HCl
c) HI
d) All of these

97) A hydrocarbon reacts with hypochlorous acid to give 1 – chloro – 2 – hydroxyethane. The hydrocarbon is
a) Ethylene
b) Methane
c) Ethane
d) Acetylene

98) An unknown unsaturated hydrocarbon on ozonolysis followed by reduction with zinc dust and water forms 1, 6 – hexanedial. The hydrocarbon is
a) 1 – Hexyne
b) 2 – Hexyne
c) Cyclohexyne
d) Cyclohexene

99) A gas decolourises alk. KMnO4 solution but does not give a precipitate with  with ammonical  AgNO3  solution.  The gas is
a) Methane
b) Ethane
c) Ethylene
d) Accelytene

100) The type of isomerism not exhibited by alkenes is
a) Chain isomerism
b) Metamerism
c) Position isomerism
d) Geometrical isomerism


Answer

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