Hydrocarbons MCQs – 2

1) The IUPAC name of the compound, is
a) 1 -Chloro-3-methylbutane
b) 2-Methyl-4-chlorobutane
c) 2-Methyl-1-chlorobutane
d) 1-Chloropentane

2) The IUPAC name of is
a) 4-Hydroxy-1-methylpentanal
b) 4-Hydroxy-2-methylpentanal
c) 2-Hydroxy-4-methylpentanal
d) 2-Hydroxy-2-methylpentanal

3) The IUPAC name of CH3OC2H5 is
a) Methyl ethyl ether
b) Ethyl methyl ether
c) Methoxyethane
d) Ethoxymethane

4) CH3CH2CH2CH(CH = CH2)CH2CH2CH3 is
a) 4-Ethenylheptane
b) 3-Propyl -1-hexene
c) 4-Ethenylhexane
d) Non-4-ene

5) The IUPAC name of tert-butyl chloride is
a) 4-Chlorobutane
b) 2-Chlorobutane
c) 1 -Chloro-3-methylpropane
d) 2-Chloro-2-methylpropane

6) The IUPAC name of acraldehyde is
a) Prop-2-en-1-al
b) Propenylaldehyde
c) But-2-en-1-al
d) Propenal

7) The IUPAC name of the compoundis
a) 3, 4, 4-Trimethylheptane
b) 3, 4, 4-Trimethyloctane
c) 2-Butyl-2-methyl-3-ethylbutane
d) 2-Ethyl-3, 3-dimethylheptane

8) The IUPAC name of CH3CH=CHCOOC2H5 is
a) Ethyl but-1-enoate
b) Ethyl but-2-enoate
c) Ethyl prop-2-enoate
d) None of these

9) The correct IUPAC name of the alcohol, [(CH3)2CH]3COH is
a) 2,4-Dimethyl-3-(1-methylethyl)pentan-3-ol
b) Tri-isopropylcarbinol
c) 2, 4-Dimethyl-3-isopropylpentan-3-ol
d) Tri-isopropylmethanol

10) IUPAC name of the following compound is

a) 1,1,1,4, 4-Pentachloro-2, 3-diethyl-butane
b) 3-(Dichloromethyl)-4-(trichloromethyl)- hexane
c) 3-(Trichloromethyl)-4-(dichloromethyl)- hexane
d) 1,1, 4, 4, 4-Pentachloro-2, 3-diethylbutane

11) The systematic name for the compound, is
a) 1, 5-Dibromo-2, 6-Dichloro-3, 4-diisopn pylhexane
b) 2, 6-Dibromo-1, 5-Dichloro-3, 4-diisopn pylhexane
c) 4-(1 -Bromo-2-chloroethyl)-5-(2-bromo-1 -chloroethyl)octane
d) 4-(2-Bromo-2-chloroethyl) octane-5-(bromo-2-chloroethyl)octane

12) The correct IUPAC name of (HOCH2CH2O)2CH – COOH is
a) 2, 2-Bis (2-hydroxyethoxy)ethanoic acid
b) 4-Carboxy-3, 5-dioxaheptane-1, 7-diol
c) 2, 2-Bis (2-hydroxyethoxy)acetic acid
d) None of the above

13) The IUPAC name of the compound,
a) Ethyl 2-methyl-2-(n-nitrophenyl) propionate
b) Ethyl 2-methyl-2-(m-nitrophenyl) propionate
c) Ethyl 2-methyl-2-(3-nitrophenyl) Propanoate
d) Ethyl 2-methyl-2-(3-nitrophenyl) propionic acid

14) The IUPAC name of the compound, is
a) 1,1-Dibutyl-2, 3-dimethylbutane
b) 2, 4, 4-Dibutyl-3, 3-dimethylbutane
c) 5-(1, 2-Dimethylpropyl)nonane
d) 4-Butyl-2, 3-dimethyloctane

15) The IUPAC name of the compound is
a) 4-(2-OxocyclohexyI) butan-2-one
b) 1 -(2-Oxocyclohexyl)butan-3-one
c) 4-(2-Oxobutyl)cyclohexan-1 -one
d) 2-(3-Oxobutyl)cyclohexan-1 -one

16) The IUPAC name of citric acid is
a) 1, 2, 3-Tricarboxy-2-propanol
b) 3-Carboxy-3-hydroxy-1,5-pentanedioic acid
c) 2-Hydroxypropane-1, 2, 3-tricarboxylic acid
d) 3-Hydroxy-1, 2, 3-tricarboxypropane

17) The common name of C6H5CH = CHCOOH is
a) Succinic acid
b) 1-Phenyl -2- propenoic acid
c) Styrene -B- carboxylic acid
d) Cinnamic acid

18) The IUPAC name of is
a) 4-Ethyl-5,6,7,9-tetramethyldeca-2,9-diene
b) 7-Ethyl-2, 4, 5,6-tetramethyldeca-1, 8-diene
c) 7-Ethyl-2, 4, 5,6-tetramethyldeca-1, 7-diene
d) 7-(1-Propenyl)-2, 3, 4, 5-tetramethyl-non-1-ene

19) @ The IUPAC name of the well known terpene camphor having the structure is
a) 6-Oxo-1,2,2-trimethylbicyclo[2.2.1]heptane
b) 1,7,7-Trimethylbicyclo[2.2.1]heptan-2-one
c) 1, 5, 5-Trimethylbicyclo[2.1.1] hexan-2-one
d) 1,7,7-Trimethylbicyclo[2.1.2]heptan-2-one

20) The Diels-Alder reaction between 1, 3-cyclo-hexadiene and acrylonitrile gives the product,Its IUPAC name is
a) Bicyclo[2.2.2]oct-2-en-5-carbonitrile
b) Bicyclo[2.2.2]oct-5-en-2-carbonitrile
c) 3-Cyanobicyclo[2.2.2]oct-5-ene
d) 2-Cyanobicyclo[2.2.2]oct-5-ene

21) The IUPAC name of the alkane is
a) 2, 2, 6, 6, 7-Pentamethyloctane
b) 2, 3, 3, 7, 7-Pentamethyloctane
c) 5-fe/t-butyl-2-isopropyl-2-methylpentane
d) 2-lsopropyl-2, 6, 6-trimethylheptane

22) The IUPAC name of the spiro compound is
a) 2-Methylspiro[5.4]deca-1, 6-diene
b) 2-Methylspiro[4.5]deca-1,6-diene
c) 8-Methylspiro[4.5]deca-1, 7-diene
d) 3-Methylspiro[5.4]deca-3, 7-diene

23) The correct IUPAC name of the spiro compound is
a) 5-Oxaspiro[3.4]octane
b) 1-Oxaspiro[4.3]octane
c) 5-Oxospiro[3.4]octane
d) 1-Oxospiro[3.4]octane

24) The IUPAC name of the compound, is
a) 1,3-Biscyclobutylcyclobutane
b) 1,3-Dicyclobutylcyclobutane

25) The compound CH3-C = C-CH3 can be named in the IUPAC system as
a) Dimethylacetylene
b) Crotonylene
c) But-2-yne
d) All the above

26) @ The compound, (C H 3)2C(OH)CH2CH3 is called, in the IUPAC system as
a) 2-Methylbutan-2-ol
b) t-Pentyl alcohol
c) Ethyldimethylcarbinol
d) All the above

27) In which of the following, all the C-C bond lengths are the same?
a) 2-Butene
b) Benzene
c) 1-Butene
d) Propyne

28) The number of in benzene is

29) Which of the following is not aromatic?
a) Benzene
b) Cyclooctatetraenyl dianion
c) Tropylium ion
d) Cyclopentadienyl cation

30) The cylindrical shape of the electron cloud of alkynes is due to
a) three sigma C – C bonds

31) Which one is false in the following statements?
b) Each carbon in acetylene is in sp-hybridization

32) Select the molecule which has only one
a) HC = CH

33) The hybridization involved in the six carbon atoms of benzene is
c) All six sp

34) leads to which shape of the molecule?
a) Tetrahedral
b) Octahedral
c) Linear
d) Trigonal planar

35) In compound, bond is of the type

36) Which of the following is not aromatic?
a) Benzene
b) Pyridine
c) Pyrimidine
d) 1, 4-Dioxane

37) The bond length of ethane (I), ethene (II), acetylene (III) and benzene (IV) follows the order
a) I > IV > II > III
b) I > II > IV > III
c) I > II > III > IV
d) III > IV > II > I

38) The type of hybridizations exhibited by carbons in   are

39) The structural formula of a compound is . The types of hybridization at the four carbons from left to right are

40) As the s-character of hybrid orbital increases, the bond angle
a) Increases
b) Decreases
c) Does not change
d) Becomes zero

41) Which of the following has all the atoms in the same plane ?
a) Methane
b) Cis-2- butene
c) Benzene
d) Isobutane

42) The number of sigma and pi-bonds in 1-butene 3-yne are
a) 5 sigma and 5 pi
b) 7 sigma and 3 pi
c) 8 sigma and 2 pi
d) 6 sigma and 4 pi

43) The bond order of the individual carbon-carbon bonds in benzene is
a) One
b) Two
c) Between one and two
d) One and two alternately

44) The carbon atoms in benzene molecule are inclined at an angle of

45) The bond length between carbon atoms is

46) The ratio of
a) 1 : 4
b) 1 : 2
c) 3 : 1
d) 1 : 6

47) The structure of is
a) Linear
b) Planar
c) Non-planar
d) A hybrid of several resonance structures

48) How many primary carbon atoms are there in the following molecule?
a) 3
b) 4
c) 5
d) 6

49) 2-Pentene contains

50) Which among the following is aromatic?
a) I
b) II
c) III
d) IV

51) Toluene has

52) In which of the following species are all types of hybrid carbons present?

53) How many H-C-H bond angles are present in a methane molecule?
a) 1
b) 3
c) 4
d) 6

54) In which of the following compounds does the cloud contains double the number of p-electrons present in benzene?
a) Biphenyl
b) Naphthalene
c) Furan
d) Pyridine

55) The aromaticity of the following heterocycles is in the order
a) thiophene > pyrrole > furan > pyridine
b) furan > pyrrole > thiophene > pyridine
c) pyridine > thiophene > pyrrole > furan
d) pyridine > furan > pyrrole > thiophene

56) In benzyne, the triple bond consists of
a) one sp-sp sigma bond and two p-p pi bonds
b) two sp-sp sigma bonds and one p-p pi bond
d) One sp2 – sp2 sigma bond, one sp2 – sp2 bond with lateral overlap and one p-p pi bond

57) The heat of hydrogenation of benzene is 51 kcal/mol and its resonance energy is 36 kcal/mol. Then the heats of hydrogenation of cyclohexadiene and cyclohexene per mole respectively are
a) 58 kcal, 58 kcal
b) 25 kcal, 29 kcal
c) 29 kcal, 58 kcal
d) 58 kcal, 29 kcal

58) According to Huckel rule, which out of 6,8,10 and 12 are Huckel numbers?
a) 6,8 and 10
b) 8,10 and 12
c) 6 and 10 only
d) 6,10 and 12

59) The resonance energy per benzene ring is maximum for
a) Benzene
b) Naphthalene
c) Phenanthrene
d) Anthracene

60) Which of the following annulenes is aromatic?
a) Cyclodecapentaene
b) Cyclooctatetraene
c) Cyclobutadiene
d) Benzene

61) Which of the following compounds (a,b and c) have the same number of sigma bonds?
(a) trans -2- butane;(b) n-propyl alcohol ;(c)benzene

a) (a) and (b)
b) (b) and (c)
c) (a) and (c)
d) (a),(b) and (c)

62) In which of the following compounds does the cloud contain the same number of electrons? (a)naphthalene ;(b) anthracene; (c) phenanthrene
a) (a) and (b)
b) (b) and (c)
c) (a) and (c)
d) (a),(b) and (c)

63) Which of the following compounds contain only carbons atoms;(a) Isobutane;(b) Cyclohexane; (c) Toluene ?
a) (a) and (b)
b) (b) and (c)
c) (c) and (d)
d) (a),(b) and (c)

64) Which of the following compounds use only carbons for bonding :(a)Pyridine,(b) Furan, (c) Benzene
a) (a) and (b)
b) (b) and (c)
c) (a) and (c)
d) (a),(b) and (c)

65) Which of the following molecules contains only primary carbon atoms :(a) Neopentane;(b) Neohexane ;(c) 2, 2, 3, 3-Tetramethylbutane ?
a) (a) and (b)
b) (b) and (c)
c) (a) and (c)
d) (a),(b) and (c)

66) Which of the following contain the same number of linearly arranged carbon atoms in their respective molecules : (a) ;(b) ;(c) ?
a) (a) and (b)
b) (b) and (c)
c) (a) and (c)
d) (a),(b) and (c)

67) Which of the following molecules is essentially non-planar?
a) 1, 3-Butadiene
b) Phenylacetylene
c) Styrene
d) 1,2-Propadiene

68) Cyclodecapentaene is not expected to be aromatic because it
a) Does not contain the aromatic sextet
b) Does not contain a benzene ring
c) Does not conform to the Huckel rule
d) Is not likely to be planar

69) Which of the following conditions is not essential for a molecular to be aromatic?
b) Be planar 
c) Be cyclic
d) Have the aromatic sextet

70) Which of the following is/are anti-aromatic ?
a) Cyclobutadiene
b) cyclooctatetraene
c) Cycloheptatriene
d) All the above

71) Petroleum contains mainly
a) Aliphatic hydrocarbons
b) Aromatic hydrocarbons
c) Both aliphatic and aromatic hydrocarbons
d) Inorganic compounds

72) Petroleum is formed under the earths crust by chemical changes in
a) Vegetable matter
b) Both vegetable and animal matter.
c) Animal matter
d) Inorganic matter

73) The inorganic (carbide) theory about the origin of petroleum was put forward by
a) Moissan
b) Engler
c) Mendeleeff
d) Sabatier and Sendrens

74) Petroleum is a mixture of hydrocarbons containing
d) or more

75) The main constituent of natural gas is
a) Methane
b) Ethene
c) Propene
d) Ethyne

76) Gasoline is a mixture of

77) When crude petroleum is distilled, the order in which the fractions are collected is
a) Kerosene, naphtha, diesel oil
b) Diesel oil, kerosene, naphtha
c) Naphtha, kerosene, diesel oil
d) Naphtha, diesel oil, kerosene

78) Which one of the following is not present in light petroleum distillates ?
a) Paraffin wax
b) Benzene
c) Petroleum ether
d) Gasoline

79) Which one of the following is not a product of petroleum refining ?
a) Gasoline
b) Kerosene oil
c) Diesel oil
d) Lamp black

80) Crude oil rich in cycloalkanes is called
a) Asphaltic
b) Paraffinic
c) Olefinic
d) None of the above

81) Kerosene is a mixture of
a) Alkanes
b) Aromatic compounds
c) Alcohols
d) Aliphatic acids

82) Diesel is a mixture of hydrocarbons containing

83) Domestic cooking gas (LPG) mainly contains
a) Hydrogen and acetylene
b) Methane and ethane
c) Ethylene and carbon monoxide
d) Liquefied butane and isobutane

84) In any fuel, the percentage of isooctane by volume in a mixture of isooctane and n-heptane which has the same anti- knocking properties as the fuel under examination is called the
a) Octane number
b) Cetane number
c) Gold number
d) None of these

85) A fuel has an octane number of 75. It is as good as a mixture of
a) 75% n-heptane + 25% octane
b) 75% octane + 25% n-heptane
c) 75 litres of isooctane
d) 75% isooctane + 25% n-heptane.

86) The branching of the hydrocarbon chain
a) Increases the octane number
b) Decreases the octane number
c) Has no effect on the octane number
d) All the above.

87) In a mixture of isooctane and n-heptane, the percentage of n-heptane is 10. The octane number of the fuel is
a) 10
b) 80
c) 90
d) 100.

88) The octane number of 124 is given to

a) 2,2, 4-Trimethylpentane
b) 2,3,4-Trimethylpentane
c) 2,2,3-Trimethylbutane
d) 2,2,3-Trimethylpentane.

89) Which one of the following has the highest octane number ?
a) n-Heptane
b) n-Nonane
c) Tripane
d) Isooctane.

90) Which of the following is not present in petrol used for aviation purposes ?
a) Highly branched chain paraffins
b) Olefinic hydrocarbons
c) Aromatic hydrocarbons
d) Straight chain hydrocarbons.

91) The octane number of a fuel can be increased by
a) Isomerization alone
b) Alkylation alone
c) Aromatization alone
d) All the three above.

92) High octane gasoline contains a:
a) Large proportion of branched chain hydrocarbons
b) Large proportion of n-octane
c) Large proportion of straight chain hydrocarbons
d) Large proportion of isooctane only.

93) The process of reforming involves
a) Cyclization alone
b) Isomerization alone
c) Aromatization alone
d) All the above.

94) The most commonly used catalyst in reforming is
a) Platinum
b) Nickel
c) Palladium
d) Aluminium.

95) [email protected] TEL causes pollution. Its use can be avoided by
a) Using gasoline with low octane number
b) Using gasoline with high octane number
d) None of these.

96) The addition of BTX increases the octane number of gasoline. BTX stands for
a) Butane, TEL and xylene
b) Butene, TEL and xylene
c) Benzene, toluene and xylene
d) Benzene, TEL and xylene.

97) The reaction,

is an illustration of
a) Isomerization
b) Hydrogenation
c) Cracking.
d) None of these

98) Which of the following are not the likely products of cracking of n-butane at 873 K?
a) Ethane and ethene
b) Propene and methane
c) 1 -Butene and hydrogen
d) Isooctane and hydrogen .

99) The quality of a diesel sample is measured in terms of its
a) Cetane number
b) Octane number
c) Gold number
d) Avogadro number.

100) The IUPAC name of cetane is
a) n-Heptane
b) Isooctane
c) Hexadecane
d) n-Dodecane.


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