Which four of the following statements about alkenes are correct?

Alkenes are insoluble in non-polar solvents such as cyclohexane

At normal temperatures and pressures, the first six members are liquids.

Alkenes are unsaturated hydrocarbons

Alkenes are insoluble in non-polar solvents such as cyclohexane

The process of catalytic cracking involves using

an aluminium oxide catalyst to produce larger hydrocarbons

an aluminium catalyst to produce larger hydrocarbons

an aluminium catalyst to produce smaller hydrocarbons

an aluminium oxide catalyst to produce smaller hydrocarbons

an aluminium oxide catalyst to produce larger hydrocarbons

Organic compound can be formed by.

Plants and animals and synthesis in laboratory

Pyrolysis of coal with heavy oil in presence of H2 at 250 atm. 350oC and catalyst yields.

A mixture of low boiling hydrocarbons

Organic compounds are found only in.

Both animal and vegetable kingdom

Organic compounds are separated into groups called homologous series. Which one of the following is not a property of a homologous series?

All members have the same general formula.

Successive members differ by CH

They have similar chemical properties.

They have similar physical properties.

Which three of the following are properties of alkynes?

The lower members are gases at normal temperatures and pressures.

Alkynes have similar physical properties.

The lower members are gases at normal temperatures and pressures.

Alkynes are soluble in non-polar solvents like methylbenzene.

Which statement about benzene is correct?

Benzene reacts with bromine solution as if it is unsaturated

Benzene is an isomer of cyclohexane

Benzene undergoes addition reactions more readily than hexene

The ratio of carbon to hydrogen atoms in benzene is the same as in ethyne

Liquid hydrocarbon is converted to a mixture of gaseous hydrocarbons by

Distillation under reduced pressure

If ethylene, carbon monoxide and water is heated at high temperature, which of the following is formed [AIIMS 2000]

\[{{C}_{4}}{{H}_{8}}{{O}_{2}}\]

The addition of HBr is easiest with \[\] [MP PMT 2000]

\[{{(C{{H}_{3}})}_{2}}C=C{{H}_{2}}\]

The most stable carbonium ion among the following is [JIPMER 2002; AFMC 2002]

\[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]

\[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,H{{C}_{6}}{{H}_{5}}\]

\[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]

\[C{{H}_{3}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]

\[{{C}_{6}}{{H}_{5}}C{{H}_{2}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]

155 + Mcqs in Hydrocarbons in Chemistry Page 2 McqOptions

51.	Which four of the following statements about alkenes are correct?
A.	At normal temperatures and pressures, the first six members are liquids.
B.	Their general formula is CNH2N
C.	Alkenes are unsaturated hydrocarbons
D.	Alkenes are insoluble in non-polar solvents such as cyclohexane
Answer» D. Alkenes are insoluble in non-polar solvents such as cyclohexane

Discussion

52.	The general formula for the alkenes is
A.	CnHn
B.	CnH2n+2
C.	CnH2n-2
D.	CnH2n
Answer» E.

Discussion

53.	How many isomers are there of pentane?
A.	2
B.	1
C.	3
D.	4
Answer» D. 4

Discussion

54.	How many other unsaturated isomers are there of pent-1-ene?
A.	3
B.	1
C.	2
D.	4
Answer» E.

Discussion

55.	How many cyclic isomers are there of pentene?
A.	1
B.	3
C.	2
D.	4
Answer» E.

Discussion

56.	The process of catalytic cracking involves using
A.	an aluminium catalyst to produce larger hydrocarbons
B.	an aluminium catalyst to produce smaller hydrocarbons
C.	an aluminium oxide catalyst to produce smaller hydrocarbons
D.	an aluminium oxide catalyst to produce larger hydrocarbons
Answer» D. an aluminium oxide catalyst to produce larger hydrocarbons

Discussion

57.	Which gas is obtained on treating aluminium carbide with diluted HCl
A.	Ethane
B.	Acetylene
C.	Methane
D.	Ethyne
Answer» D. Ethyne

Discussion

58.	The overlapping of orbitals in benzene is of the type
A.	p – p
B.	sp – sp
C.	2 and 3
D.	sp2– sp2
Answer» D. sp2– sp2

Discussion

59.	Organic compound can be formed by.
A.	Animals only
B.	Plants and animals and synthesis in laboratory
C.	Plants only
D.	Plants and animals only
Answer» C. Plants only

Discussion

60.	Gasoline has the formula
A.	C8– C10
B.	C6– C8
C.	C3– C5
D.	C10– C12
Answer» C. C3– C5

Discussion

61.	n-pentane and iso pentane can be distinguished by
A.	Br2
B.	N3
C.	KMnO4
D.	O3
Answer» D. O3

Discussion

62.	An aqueous solution of a substance on electrolysis gives ethane. The substance is
A.	Active acid
B.	Acetamide
C.	Potassium acetate
D.	Ethyl acetate
Answer» D. Ethyl acetate

Discussion

63.	Pyrolysis of coal with heavy oil in presence of H2 at 250 atm. 350oC and catalyst yields.
A.	A mixture of low boiling hydrocarbons
B.	CH4
C.	C3H8
D.	C2H6
Answer» B. CH4

Discussion

64.	Organic compounds are found only in.
A.	Animal kingdom
B.	Mineral kingdom
C.	Vegetable kingdom
D.	Both animal and vegetable kingdom
Answer» E.

Discussion

65.	Marsh gas mainly contains
A.	C2H2
B.	CO
C.	CH4
D.	H2S
Answer» D. H2S

Discussion

66.	Ethyl alcohol is heated with conc. H2SO The product formed is
A.	C2H6
B.	C2H2
C.	C2H4
D.	CH3COOC2H5
Answer» B. C2H2

Discussion

67.	The ethyne produced in the laboratory contains two known impurities which are removed by passing them through an acidified copper sulfate solution. These impurities are
A.	hydrogen sulfate and phosphine
B.	copper sulfide and potassium
C.	hydrogen sulfide and phosphine
D.	hydrogen sulfide and potassium
Answer» D. hydrogen sulfide and potassium

Discussion

68.	Organic compounds are separated into groups called homologous series. Which one of the following is not a property of a homologous series?
A.	All members have the same general formula.
B.	Successive members differ by CH
C.	They have similar chemical properties.
D.	They have similar physical properties.
Answer» E.

Discussion

69.	In hydrocarbons, the C and H bonds are joined together by
A.	ionic bonds
B.	hydrogen bonds
C.	dipole-dipole attractions
D.	covalent ions
Answer» E.

Discussion

70.	Which three of the following are properties of alkynes?
A.	They are all soluble in water.
B.	Alkynes have similar physical properties.
C.	The lower members are gases at normal temperatures and pressures.
D.	Alkynes are soluble in non-polar solvents like methylbenzene.
Answer» C. The lower members are gases at normal temperatures and pressures.

Discussion

71.	The main source of most organic compound is
A.	methane
B.	petroleum
C.	coal tar
D.	both (a) and (b)
Answer» E.

Discussion

72.	What product is obtained by heating ethylidene chloride with alcoholic KOH
A.	Ethene
B.	Ethane
C.	Ethyne
D.	Methane
Answer» D. Methane

Discussion

73.	Which statement about benzene is correct?
A.	Benzene reacts with bromine solution as if it is unsaturated
B.	Benzene is an isomer of cyclohexane
C.	Benzene undergoes addition reactions more readily than hexene
D.	The ratio of carbon to hydrogen atoms in benzene is the same as in ethyne
Answer» E.

Discussion

74.	What product is obtained by passing ethanol vapours over heated alumina
A.	CH4
B.	C2H4
C.	C2H6
D.	C2H2
Answer» C. C2H6

Discussion

75.	Water product is obtained on electrolyzing potassium fumarate
A.	C2H4
B.	CH4
C.	C2H2
D.	C2H6
Answer» D. C2H6

Discussion

76.	Domestic cooking gas consists of mostly
A.	Liquefied butane and isobutene
B.	Methane and ethane
C.	C2H4 and CO
D.	H2 and acetylene
Answer» B. Methane and ethane

Discussion

77.	Which hydrocarbon has a molecular formula different from that of the other three?
A.	2,3-dimethylpentane
B.	2,2,3,3-tetramethylbutane
C.	2,2,3-trimethylbutane
D.	3-ethylpentane
Answer» C. 2,2,3-trimethylbutane

Discussion

78.	Liquid hydrocarbon is converted to a mixture of gaseous hydrocarbons by
A.	Oxidation
B.	Cracking
C.	Hydrolysis
D.	Distillation under reduced pressure
Answer» C. Hydrolysis

Discussion

79.	Which of the following is used as antiknock?
A.	T E L
B.	Lead tetrachloride
C.	Lead acetate
D.	Ethyl acetate
Answer» B. Lead tetrachloride

Discussion

80.	Out of the following fractions of petroleum, the one having the lowest boiling point is or Which of the following is obtained at lowest temperature by fractional distillation of petroleum [MP PMT 1993; MP PET 1996]
A.	Kerosene
B.	Diesel oil
C.	Gasoline
D.	Heavy oil
Answer» D. Heavy oil

Discussion

81.	Formation of 2-butene as major product by dehydration of 2-butanol is according to [MP PMT 1995]
A.	Markownikoff rule
B.	Saytzeff rule
C.	Peroxide effect
D.	Anti-Markownikoff rule
Answer» C. Peroxide effect

Discussion

82.	If ethylene, carbon monoxide and water is heated at high temperature, which of the following is formed [AIIMS 2000]
A.	\[{{C}_{4}}{{H}_{8}}{{O}_{2}}\]
B.	\[{{C}_{2}}{{H}_{5}}COOH\]
C.	\[C{{H}_{3}}COOH\]
D.	\[C{{H}_{2}}=CH-COOH\]
Answer» C. \[C{{H}_{3}}COOH\]

Discussion

83.	The addition of HBr is easiest with \[\] [MP PMT 2000]
A.	\[ClC{{H}_{2}}=CHCl\]
B.	\[ClCH=CHCl\]
C.	\[C{{H}_{3}}-CH=C{{H}_{2}}\]
D.	\[{{(C{{H}_{3}})}_{2}}C=C{{H}_{2}}\]
Answer» E.

Discussion

84.	Nitrobenzene can be prepared from benzene by using a mixture of conc. \[HN{{O}_{3}}\] and conc. \[{{H}_{2}}S{{O}_{4}}.\] In the nitrating mixture, \[HN{{O}_{3}}\] acts as a [IIT-JEE 1997]
A.	Base
B.	Acid
C.	Reducing agent
D.	Catalyst
Answer» B. Acid

Discussion

85.	Acetylene reacts with \[HCN\] in the presence of \[Ba{{(CN)}_{2}}\]to yield [UP SEAT 2004]
A.	1, 1-dicyanoethane
B.	1, 2-dicyanoethane
C.	Vinyl cyanide
D.	None of these
Answer» D. None of these

Discussion

86.	The reaction \[C{{H}_{3}}CH=C{{H}_{2}}\underset{{{H}^{^{+}}}}{\mathop{\xrightarrow{(CO+{{H}_{2}})}}}\,C{{H}_{3}}-\underset{COOH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{\|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,\,\,\,\,\,}}\,\,\,\] is known as [MP PMT 2002]
A.	Wurtz reaction
B.	Koch reaction
C.	Clemmensen reduction
D.	Kolbe?s reaction
Answer» C. Clemmensen reduction

Discussion

87.	Which of the following yield both alkane and alkene [AFMC 2004]
A.	Kolbe?s reaction
B.	Williamson?s synthesis
C.	Wurtz reaction
D.	Sandmeyer reaction
Answer» B. Williamson?s synthesis

Discussion

88.	Benzene is obtained from [CPMT 1996]
A.	Coaltar
B.	Plant
C.	Animal
D.	Charcoal
Answer» B. Plant

Discussion

89.	In chlorination of benzene, the reactive species is [MP PET 2000]
A.	\[C{{l}^{+}}\]
B.	\[C{{l}^{-}}\]
C.	\[C{{l}_{2}}\]
D.	\[C{{l}_{2}}^{-}\]
Answer» B. \[C{{l}^{-}}\]

Discussion

90.	After ozonolysis of benzene (not hydrolysis), the product is [RPMT 1997; CPMT 1997]
A.	Benzene triozonide
B.	Glyoxal
C.	Ethanediol
D.	All of them
Answer» B. Glyoxal

Discussion

91.	Which of the following is not formed by the ozonolysis of o-xylene
A.	Glyoxal
B.	Ethyl glyoxal
C.	Dimethyl glyoxal
D.	Methyl glyoxal
Answer» C. Dimethyl glyoxal

Discussion

92.	How is is widely used [MP PET 2002]
A.	Insecticide
B.	Drug
C.	Explosive
D.	Dye
Answer» D. Dye

Discussion

93.	Benzene shows [RPMT 1999]
A.	Substitution
B.	Addition
C.	Oxidation
D.	All of these
Answer» E.

Discussion

94.	Amongst the following, the compound that can be most readily sulphonated is [IIT-JEE 1982; MADT Bihar 1995; KCET 2005]
A.	Benzene
B.	Nitrobenzene
C.	Toluene
D.	Chlorobenzene
Answer» D. Chlorobenzene

Discussion

95.	o, p-directing groups are mostly
A.	Activating groups
B.	Deactivating groups
C.	Neutral groups
D.	None of these
Answer» B. Deactivating groups

Discussion

96.	Which xylene is most easily sulphonated
A.	Ortho
B.	Para
C.	Meta
D.	All at the same rate
Answer» D. All at the same rate

Discussion

97.	The reaction of benzene with chlorine in the presence of iron gives [MP PET 1993]
A.	Benzene hexachloride
B.	Chlorobenzene
C.	Benzyl chloride
D.	Benzoyl chloride
Answer» C. Benzyl chloride

Discussion

98.	The most stable carbonium ion among the following is [JIPMER 2002; AFMC 2002]
A.	\[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,H{{C}_{6}}{{H}_{5}}\]
B.	\[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]
C.	\[C{{H}_{3}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]
D.	\[{{C}_{6}}{{H}_{5}}C{{H}_{2}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]
Answer» B. \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\]

Discussion

99.	The number of \[\pi -\text{bonds}\] in the product formed by passing acetylene through dilute sulphuric acid containing mercuric sulphate is [EAMCET 1997]
A.	Zero
B.	One
C.	Two
D.	Three
Answer» C. Two

Discussion

100.	The hybridisation in methane, ethene and Ethyne respectively is [CPMT 2003]
A.	sp3, sp2 and sp
B.	sp3, sp, sp2
C.	sp2, sp3 and sp
D.	sp3, sp2, sp
Answer» B. sp3, sp, sp2

Discussion

Explore topic-wise MCQs in Chemistry.

Which four of the following statements about alkenes are correct?

The general formula for the alkenes is

How many isomers are there of pentane?

How many other unsaturated isomers are there of pent-1-ene?

How many cyclic isomers are there of pentene?

The process of catalytic cracking involves using

Which gas is obtained on treating aluminium carbide with diluted HCl

The overlapping of orbitals in benzene is of the type

Organic compound can be formed by.

Gasoline has the formula

n-pentane and iso pentane can be distinguished by

An aqueous solution of a substance on electrolysis gives ethane. The substance is

Pyrolysis of coal with heavy oil in presence of H2 at 250 atm. 350oC and catalyst yields.

Organic compounds are found only in.

Marsh gas mainly contains

Ethyl alcohol is heated with conc. H2SO The product formed is

The ethyne produced in the laboratory contains two known impurities which are removed by passing them through an acidified copper sulfate solution. These impurities are

Organic compounds are separated into groups called homologous series. Which one of the following is not a property of a homologous series?

In hydrocarbons, the C and H bonds are joined together by

Which three of the following are properties of alkynes?

The main source of most organic compound is

What product is obtained by heating ethylidene chloride with alcoholic KOH

Which statement about benzene is correct?

What product is obtained by passing ethanol vapours over heated alumina

Water product is obtained on electrolyzing potassium fumarate

Domestic cooking gas consists of mostly

Which hydrocarbon has a molecular formula different from that of the other three?

Liquid hydrocarbon is converted to a mixture of gaseous hydrocarbons by

Which of the following is used as antiknock?

Out of the following fractions of petroleum, the one having the lowest boiling point is or Which of the following is obtained at lowest temperature by fractional distillation of petroleum [MP PMT 1993; MP PET 1996]

Formation of 2-butene as major product by dehydration of 2-butanol is according to [MP PMT 1995]

If ethylene, carbon monoxide and water is heated at high temperature, which of the following is formed [AIIMS 2000]

The addition of HBr is easiest with \[\] [MP PMT 2000]

Nitrobenzene can be prepared from benzene by using a mixture of conc. \[HN{{O}_{3}}\] and conc. \[{{H}_{2}}S{{O}_{4}}.\] In the nitrating mixture, \[HN{{O}_{3}}\] acts as a [IIT-JEE 1997]

Acetylene reacts with \[HCN\] in the presence of \[Ba{{(CN)}_{2}}\]to yield [UP SEAT 2004]

The reaction \[C{{H}_{3}}CH=C{{H}_{2}}\underset{{{H}^{^{+}}}}{\mathop{\xrightarrow{(CO+{{H}_{2}})}}}\,C{{H}_{3}}-\underset{COOH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,}{\mathop{CH-C{{H}_{3}}}}\,\,\,\,\,\,}}\,\,\,\] is known as [MP PMT 2002]

Which of the following yield both alkane and alkene [AFMC 2004]

Benzene is obtained from [CPMT 1996]

In chlorination of benzene, the reactive species is [MP PET 2000]

After ozonolysis of benzene (not hydrolysis), the product is [RPMT 1997; CPMT 1997]

Which of the following is not formed by the ozonolysis of o-xylene

How is is widely used [MP PET 2002]

Benzene shows [RPMT 1999]

Amongst the following, the compound that can be most readily sulphonated is [IIT-JEE 1982; MADT Bihar 1995; KCET 2005]

o, p-directing groups are mostly

Which xylene is most easily sulphonated

The reaction of benzene with chlorine in the presence of iron gives [MP PET 1993]

The most stable carbonium ion among the following is [JIPMER 2002; AFMC 2002]

The number of \[\pi -\text{bonds}\] in the product formed by passing acetylene through dilute sulphuric acid containing mercuric sulphate is [EAMCET 1997]

The hybridisation in methane, ethene and Ethyne respectively is [CPMT 2003]