CBSE Questions for Class 11 Medical Chemistry Hydrocarbons Quiz 11 - MCQExams.com

Which of the following statements regarding 1,2-dimethyl cyclopentane and 1,3-dimethyl cyclopentane is/are correct?
  • In both , cis form is meso,while trans form is resolvable
  • In both , trans form is meso,while cis form is resolvable
  • In both,cis and tans forms are meso.
  • In both,cis and tans forms are resolvable.
Compound $$(E)$$ is:
  • Propyne
  • Butyne
  • cis-But $$-2-$$ yne
  • trnas-But $$-2-$$ yne
Acidic hydrogen is present in:
  • Ethyne
  • Ethene
  • Benzene
  • Ethane
Which is the correct IUPAC name for  $$CH_3CH(C_2H_5)CH_2-Br$$
  • 1-Bromo-2-ethylpropane
  • 1-Bromo-2-ethyl2-methylethane
  • 1-Bromo-2-methylbutane
  • 2-Methyl-1-bromobutane
Bromine reacts with saturated hydrocarbon at room temperature in the
  • absence of sunlight
  • presence of water
  • presence of sunlight
  • presence of hydrochloric acid
The number of single and double bonds present in benzene are
  • $$9$$ and $$6$$
  • $$9$$ and $$3$$
  • $$12$$ and $$3$$
  • $$12$$ and $$6$$
IUPAC name of iso-butane is :
  • 2-methyl butane
  • 2-methyl propane
  • 2-ethyl butane
  • 2-butyne
Which of the following groups do not show addition reactions?
  • Alkanes
  • Alkaloids
  • Cycloalkenes
  • Ketones
The IUPAC of the hydrocarbon represented by the Swastik sign is 
1873334_06c1a3702bf04cb6ae103338c072387e.png
  • Neononane
  • Tetraethylcarbon
  • $$2$$-Ethylpentane
  • $$3,3$$-Diethylpentane
The IUPAC for the compound is 
1873351_f5f72e51644141b9acd7ba451dcbc18d.png
  • $$2$$-Cyclopentylpropane
  • $$1,1$$-Dimethyl-$$1$$-cyclopentylmethane
  • ($$1$$-Methylethyl)cyclopentane
  • $$1$$-Cyclopentylpropane
The IUPAC name of  
$$CH_{3} - \underset{C_{2}H_{5}\!\!\!\!}{\underset{|} {\overset{H} {\overset{|} {C}}}} - \underset{CH_{3}\!\!\!\!\!\!}{\underset{|} {\overset{C_4H_9} {\overset{|} {C}}}} - CH_{3} $$ is 
            
  • $$2$$-Butyl-$$2$$-methyl-$$2$$-ethylbutane
  • $$2$$-Ethyl-$$3,3$$-dimethylheptane
  • $$3 , 4 , 4 $$-Trimethylheptane
  • $$3,4 ,4$$-Trimethyloctane.
What is the better way to prepare $$3$$-ethyl-$$3$$-heptene?
226555.png
  • Make a Wittig reagent from $$1$$-bromobutane and combine that with $$3$$-pentanone
  • Make a Wittig reagent from $$3$$-bromopentane and combine that with butanal
  • It does not matter because they will work equally well
  • It does not matter because neither method will be successful
What is the ratio of $$\pi-$$ and $$\sigma$$- bonds in benzene?
  • $$1:4$$
  • $$2:1$$
  • $$1:1$$
  • $$2:2$$
Which of the following will show aromatic behaviour?
An organic compound on treatment with $$Br_2$$ in $$CCl_4$$ gives bromoderivative of an alkene. The compound will be 
  • $$CH_3-CH=CH_2$$
  • $$CH_3CH=CHCH_3$$
  • $$HC\equiv CH$$
  • $$H_2C=CH_2$$
Among the following the aromatic compounds is
Elimination reaction of 2-bromo-pentane to form pent-2-ene is:
a) $$\beta$$- Elimination reaction
b) Follows Zaitsev rule
c) Dehydrohalogenation reaction
d) Dehydration reaction
  • a), c), d)
  • b), c), d)
  • a), b), d)
  • a), b), c)
Assertion: In the Kolbe's electrolysis of an aqueous solution of sodium acetate, hydrogen gas is evolved at the cathode.
Reason: $$H^{+}$$ is easily reduced than $$Na^{+}$$.
  • Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
  • Both Assertion and Reason are correct but the Reason is not the correct explanation of Assertion
  • The Assertion is correct but the Reason is incorrect
  • The Assertion is incorrect but the Reason is correct
Aromatization in alkane can be brought by using:
  • $$Al_{2}O_{3}$$
  • $$Fe_{2}O_{3}$$
  • $$Cr_{2} O_{3} / Al_{2} O_{3}$$ at $$600^{o} C$$
  • Conc. $$H_{2} SO_{4}$$
Match the following 
List -I 
(Products)
List -II
(Reactants-Reaction)
A) Methane(1) Sabatier - Senderens reaction of propylene 
B) Ethane(2) Wurtz reaction of methyl iodide
C) Propane(3) Decarboxylation of sodium acetate 
D) Butane(4) Sodium butanoate by Kolbes electrolysis
                  (5) Sodium propanoate by Kolbes electrolysis
The correct match is :
  • A-2 B-3 C-1 D-5
  • A-4 B-2 C-1 D-5
  • A-3 B-2 C-1 D-5
  • A-2 B-3 C-1 D-4
DBN is a bicyclic compound which is used as base. What is the major product in the following reaction? 

74364_dff3605d207c4cfbbaff54bd01f7169c.png
  • Both A and B
The total number of stereoisomers of $$(CH_3\! -\! \! CH\! \! =\! \! CH\! -\! \! CH_2 )_3 CH$$ is:
  • 6
  • 4
  • 3
  • 5
$$\left( { CH }_{ 3 } \right) _{ 3 }C-MgCl$$ on reaction with $${ D }_{ 2 }O$$ produces :
  • $$\left( { CH }_{ 3 } \right) _{ 3 } CD$$
  • $$\left( { CH }_{ 3 } \right) _{ 3 } OD$$
  • $$\left( { CD }_{ 3 } \right)C MgCl$$
  • $$\left( { CD }_{ 3 } \right) _{ 3 } OD$$
The total number of isomeric bromo-chloro-fluoro-iodopropadienes is:
  • 5
  • 6
  • 7
  • 8
The nature of the aqueous solution after Kolbe electrolysis is:
  • acidic
  • alkaline
  • neutral
  • may be acidic, alkaline or neutral
In the above reaction, 'A' is a carbide of $$3^{rd}$$ period element which forms amphoteric oxide. D can be converted into B by using:

19719_a49d88c69e9749f083b42f395b5dda27.png
  • $$Ni$$
  • $$Na/ether$$
  • $$Zn- Hg / HCl$$
  • $${ LiAlH }_{ 4 }$$
The compound with the highest boiling point is
  • n-hexane
  • n-pentane
  • 2, 2-dimethylpropane
  • 2-methylbutane
The correct IUPAC name of the following hydrocarbon is :
117989_bc8858275af34602ac553c6f439a23b3.png
  • 4,5-diisopropyl-3-methylheptane
  • 3-methyl-4,5-diisopropylheptane
  • 5-ethyl-4-isopropyl-3,6-dimethylheptane
  • 3-Ethyl-4-isopropyl-2,5-dimethylheptane
Isomers of hexane, based on their branching, can be divided into three distinct classes as shown in the figure.
The correct order of their boiling point is:
114053_1bdc2536af0a423aa32b53849d0eec0f.png
  • $$I > II > III$$
  • $$III > II > I$$
  • $$II > III > I$$
  • $$III > I > II$$
The correct IUPAC name of the following hydrocarbon is:
117988_f5a18a1db5e947c29cfa0507d71a2dee.png
  • 4-ethyl-6-methyl-5-propyloctane
  • 3-methyl-4-propyl-5-ethyloctane
  • 5-Ethyl-3-methyl-4-propyloctane
  • 5-ethyl-4-propyl-3-methyloctane
The major product A is :

76213_2971b5abec774557858e09c5ecf42b41.png
Number of secondary carbon atoms present in the above compounds are respectively :
117919_bd53125052244e77b8e625bba875181e.png
  • 6, 4, 5
  • 4, 5, 6
  • 5, 4, 6
  • 6, 2, 1
The major product obtained on acid catalysed hydration of 3-phenylbut-1-ene is:
  • 3-phenylbutan-2-ol
  • 2-phenylbutan-2-ol
  • 2-phenylbutan-3-ol
  • 2-phenylbutan-1-ol
Major product is
132174_f7869b6356074b01814dccae45305c5b.png
Identify the product formed.
132177_edf0a49a39584205a1a925da9dfe7def.png
  • no reaction
Based upon your understanding of the basic principles of molecular orbitals it should be possible to answer the following question.Consider the  six molecular orbitals of benzene shown. How many of these orbitals will contain electrons?

122477.png
  • Only one molecular orbitals
  • Only two molecular orbitals
  • Only three molecular orbitals
  • All six molecular orbitals
Heating benzene in a large excess of 80% $$D_{ 4 }{ SO }_{ 2 }$$ in $$D_{ 2 }O$$ results in what product?
  • $${ C }_{ 6 }{ H }_{ 5 }{ SO }_{ 3 }D$$
  • $${ C }_{ 6 }{ H }_{ 5 }OD$$
  • $${ C }_{ 6 }{ H }_{ 5 }D$$
  • $${ C }_{ 6 }{ D }_{ 6 }$$
Consider two alternative mechanisms for the chlorination of methane, Which step is crucial in deciding which mechanism is not likely to be observed?
Mechanism I:
 $$A.\ \:Cl_{2} \rightarrow 2 Cl ^{*}$$
$$B. \ \:Cl^{*}+CH_{4} \rightarrow HCl+^{*}CH_{3}$$
$$C. \ \:\dot{C}H_{3}+Cl_{2} \rightarrow CH_{3} Cl+Cl^{*}$$
Mechanism II: 
$$D.\ \:Cl_{2} \rightarrow 2 Cl ^{*}$$
$$E. \ \:Cl^{*}+CH_{4} \rightarrow CH_{3}Cl+H ^{*}$$
$$F. \ \:H^{*}+Cl_{2} \rightarrow HCl+Cl^{*}$$
  • $$I$$
  • $$II$$
  • $$I$$ and $$II$$ both
  • None
Which of the following will not form alkene as a product?
Consider two alternative mechanism for the chlorination of methane. Which step is crucial in deciding which mechanism is not likely to be observed?
  Mechanism I                                               Mechanism II
A $${ Cl }_{ 2 }\longrightarrow { 2Cl }^{ \bullet  } $$
A $${ Cl }_{ 2 }\longrightarrow { 2Cl }^{ \bullet  } $$
B $${ Cl }^{ \bullet  }+{ CH }_{ 4 }\longrightarrow HCl+_{  }^{ \bullet  }{ { CH }_{ 3 } }$$
D $${ Cl }^{ \bullet  }+{ CH }_{ 4 }\longrightarrow { CH }_{ 3 }Cl+{ H }^{ \bullet  }$$
C $$\overset { \bullet  }{ C } { H }_{ 3 }+{ Cl }_{ 2 }\longrightarrow { CH }_{ 3 }Cl+{ Cl }^{ \bullet  }$$
E $${ H }^{ \bullet  }+{ Cl }_{ 2 }\longrightarrow HCl+{ Cl }^{ \bullet  }$$
  • A
  • B
  • C
  • D
Which $${ C }_{ 9 }{ H }_{ 12 }$$ hydrocarbon would give a single $${ C }_{ 9 }{ H }_{ 11 }{ SO }_{ 3 }H$$ product on sulphonation?
How many products will be formed excluding stereo when cis-1,3,5-terimethyl cyclohexene reacts with NBS?
  • 3
  • 4
  • 5
  • 6
Based upon your understanding of the basic principles of molecular orbitals it should be possible to answer the following question. Consider the  molecular orbitals of benzene shown. Which of these molecular orbitals has the lowest energy?

122475.png
  • Orbital $$II$$
  • Orbital $$III$$
  • Orbital $$IV$$
  • Orbital $$V$$
Alkene ( P ) & ( Q ) respectively are
146717.png
How many dichlorocyclohexane would be obtained on chlorination of chlorocyclohexane (including stereoisomers)?
  • $$4$$
  • $$6$$
  • $$8$$
  • $$9$$
The major monochlorination product that forms upon treatment of $$1,1,2-$$ trimethyl cyclopentane with $$ Cl_{2}/hv $$ is:
  • 2-Chloro-1,1,2-trimethyl cyclopentane
  • 1-Chloro-2,2,3-trimethyl cyclopentane
  • 1-Chloro-2,3,3-trimethyl cyclopentane
  • 1-Chloro-1,2,2-trimethyl cyclopentane
What is the IUPAC name of above compound ?
152276_edcae1a9d22f4be2a0ad0b55f7670cf4.JPG
  • (Z)-6-bromo-2-methylhept-5-en-3-yne
  • (Z)-2-bromo-5,5-dimethylhept-2-en-4-yne
  • (Z)-2-bromo-6-methylhept-2-en-4-yne
  • (Z)-2-bromo-5-methylhept-2-en-4-yne
Consider the following carbides:
$$\underset {I}{CaC_2} {\;} \underset {II}{Be_2C} {\;} \underset {III}{MgC_2} {\;} \underset {IV}{SrC_2}$$
Select the carbide which gives different product on hydrolysis than other carbides.
  • I
  • II
  • III
  • IV
What product(s) is (are) expected during electrolysis of aqueous solution of potassium propanoate ?
  • Butane
  • Ethyl ethanoate
  • Ethyl propanoate
  • (CH3CO) O - O (OCCH3)
The sequence of reagent which can efficiently bring about the above conversion is (are) ?

227306_ac167bc8992a43db97e449f1e5ba029a.png
  • $$Br_{2}$$-hv/heat
  • $$Br_{2}$$-hv/heat, $$C_{2}H_{5}ONa/C_{2}H_{5}OH;NBS-hv;B_{2}H_{6}-

    THF$$then $$CH_{3}COOH$$
  • $$Br_{2}$$-hv/heat ; $$(CH_{3})_{3}CONa-(CH_{3})_{3}COH HBr-ROOR$$
  • NBS-hv/$$CCl_{4}$$
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