CBSE Questions for Class 11 Medical Chemistry Hydrocarbons Quiz 3 - MCQExams.com

The IUPAC name of the this compound is:

25463_239248090ca24515802d71733d5fbe97.png
  • 2-isopropyl pentane
  • 2, 3-dimethyl hexane
  • isononane
  • 2, 4-dimethyl hexane
Which one of the following is a free radical substitution reaction ?
  • $$CH_3CHO+HCN\rightarrow CH_3-\underset{OH}{\underset{|}{C}H}-CN$$
IUPAC name of $$CH_{3}-CH(CH_{3})-C\equiv C-CH(CH_{3})-CH_{3}$$  is:
  • 2,5-dimethyl-3-hexyne
  • 2,5-dimethyl-2-hexyne
  • 3,5-dimethyl-3-hexyne
  • 2-heptyne
Which of the following method is not used in the preparation of acetylene :
  • Dehydrohalogenation
  • Dehalogenation
  • Hydrolysis
  • Hydrogenation
(A) : The C, C bond length in benzene is intermediate between C, C single bond length and C, C double bond length.
(R) : Benzene molecule exhibits resonance.
  • Both (A) and (R) are true and (R) is the correct explanation of (A)
  • Both (A) and (R) are true and (R) is not the correct explanation of (A)
  • (A) is true but (R) is false
  • (A) is false but (R) is true
The IUPAC name of the given compound is:

25475_7ec78a048b7b4ab2937003a261b02eac.png
  • 3 - ethyl - 4, 4 - dimethylheptane
  • 1,1 - diethyl - 2, 2 - dimethylpentane
  • 4, 4- dimethyl - 5, 5 - diethylpentane
  • 5, 5- diethyl - 4,4 - dimethylpentane
Benzene can :
  • Discharge colour of $$KMnO_{4}$$
  • Discharge colour of bromine water
  • Polymerise
  • Undergo substitution reactions
Ethyne is not prepared by:
  • heating iodoform with $$Ag$$ powder
  • hydrolysis of calcium carbide
  • heating $$C_{2}H_{2}Cl_{4}$$ with zinc dust
  • heating iodoform with $$Na$$
$$C_{2}H_{2}\overset{Red hot}{\longrightarrow}A\overset{fuming.H_{2}SO_{4}}{\longrightarrow}B$$

'B' is :
  • Benzene
  • Toluene
  • Chlorobenzene
  • Benzene sulphonic acid
A direct iodination of benzene is not possible because :
  • Iodine is an oxidising agent
  • Resulting $$C_{6}H_{5}I$$ is reduced to $$C_{6}H_{6}$$ by $$HI$$
  • $$HI$$ is unstable
  • The ring gets deactivated
The number of structural isomers possible with molecular formula $$C_{5}H_{8}$$ is:
  • more than 7
  • 6
  • 5
  • 4
Benzene reacts with $$CH_3Cl$$ in the presence of anhydrous $$AlCl_3$$ to form:
  • xylene
  • toluene
  • chlorobenzene
  • benzyl chloride
All alkanes are gases.
  • True
  • False
Which of the following reacts with water to give ethane?
  • $$CH_{4}$$
  • $$C_{2}H_{5}MgBr$$
  • $$C_{2}H_{5}OH$$
  • $$C_{2}H_{5}OC_{2}H_{5}$$
The IUPAC name of the following compound is:

$$CH_{2} = CH - CH (CH_{3})_{2}$$
  • 1,1-dimethyl-2-propene
  • 3-methyl-1-butene
  • 2-vinyl propane
  • 1-isopropyl ethylene

$$R            C-C=R \xrightarrow[Lindlar   catalsyst]{H_2}$$?
  • Both (1) and (2)
  • $$R - CH_2 - CH_2 - R$$
Structural formula of ethyne is :
  • $$HC\equiv CH$$
  • $$H_{3} C C H$$
Ethylbenzene reacts with $$ Cl_{2}$$ in sunlight to give:
  • 1-Chloro-1-phenylethane
  • 1-Chloro-2-phenylethane
  • 4-Chloroethylbenzene
  • 3-Chloroethylbenzene
The final product of chlorination of methane in the sun light is ?
  • $$CH_{3}C_{1}$$
  • $$CH_{2}Cl_{2}$$
  • $$CHCI_{3}$$
  • $$CCI_{4}$$
Choose which one from the given options is an incorrect statement.
  • Tertiary ($$3^0$$) butyl is 1,1-Dimethylethyl
  • Neopentane is 1,1-Dimethylpropane
  • Isopentane is 2-methylbutane
  • The correct IUPAC numbering of following compound is
The unlikely representation(s) of resonating structures of fluorobenzene is
The major monobromination product in the photochemical bromination of $$2,2 -dimethyl butane$$ is:
The correct IUPAC name of the following compounds is :
117998_ee01ff9bfe33473e996ab2b87ab08234.png
  • 1, 2-dimethylpropyleyelopropane
  • 2-cyclopropyl-3-methylbutane
  • 2-methyl-3-cyclopropylbutane
  • isopentylcyclopropane

Select the correct name of the above compound :
117945.jpg
  • 2,5-diethyl-6-methyloctane
  • 4,7-diethyl-3-methyloctane
  • 4-ethyl-3, 7-dimethylnonane
  • 6-ethyl-3, 7-dimethylnonane
When cyclohexane is poured on water, it floats because :
  • cyclohexane is in a 'boat' form
  • cyclohexane is in a 'chair' form
  • cyclohexane is in a 'crown' form
  • cyclohexane is less dense than water
Structure represents -
107757.jpg
  • Isopropylidene Bromide
  • Active amylene Iodide
  • Isobutylene glycol
  • Isobutylene
The reaction $$C_6H_6 + CH_3 \xrightarrow[anhydrous]{AlCl_3} HCl + C_6H_5CH_3$$ is:
  • Friedel-Crafts alkylation
  • addition reaction
  • Friedel-Crafts acylation
  • Friedel -Craft's benzylation
No. of isomers $$C_4H_8$$ :
  • 4
  • 3
  • 2
  • 5
When methane is mixed with excess chlorine and the mixture is exposed to sunlight, the final product is:
  • $$CH_3Cl$$
  • $$CH_2Cl_2$$
  • $$CHCl_3$$
  • $$CCl_4$$
The structure shows :
107734.jpg
  • Decane
  • Propane
  • Pentane
  • Butane
$$C_6H_{12}$$ and $$C_6H_6$$ are the examples of aliphatic and aromatic hydrocarbons respectively.
  • True
  • False
Preceding and succeeding homologues of $$C_{10}H_{22}$$ respectively are:
  • $$C_7H_{14}, C_{11}H_{22}$$
  • $$C_9H_{20}, C_{11}H_{24}$$
  • $$C_{11}H_{24}, C_9H_{20}$$
  • $$C_9H_{18}, C_9H_{20}$$
The replacement of a hydrogen atom in benzene by alkyl group can be brought about with the following reagents :
  • alkyl chloride and $$AlCl_{3}$$
  • alkene and $$AlCl_{3}$$
  • alkanol and alkali
  • alkanol and acid
Give IUPAC name:

128657.png
  • 3-Ethyl-4,6-dimethyloctane
  • 4,6-dimethyl- 3-Ethyl octane
  • 3,5-dimethyl- 6-Ethyl octane
  • None of these
Which of the following statement(s) is/are incorrect?
  • Although benzene contains three double bonds, normally it does not undergo addition reaction.
  • m-chlorobromobenzene is an isomer of m-bromochlorobenzene.
  • In benzene, carbon uses all the three p orbitals for hybridization.
  • An electron donating substitutent in benzene orients the incoming electrophilic group to the meta position.
Give IUPAC name :

128644.png
  • 3,4,4 Trimethyl heptane
  • 3,4,4 Trimethyl octane
  • 2 Butyl 2 methyl 3 ethyl butane
  • 2 Ethyl 3,3 dimenthyl heptane
Give IUPAC name:

128642.png
  • Neononane
  • Tetra ethylmethane
  • 3-Ethyl pentane
  • 3,3- Diethyl pentane
The ratio of $$\sigma$$ and $$\pi$$ bonds in benzene is:
  • $$2$$
  • $$6$$
  • $$4$$
  • $$8$$
If octane number of gasoline sample is 70, then this sample will be similar to:
  • 70% n-heptane + 30% n-octane
  • 70% n-octane + 30% n-heptane
  • 70% isooctane + 30% n-heptane
  • 70% n-heptane + 30% isooctane
(E)-3-bromo-3-hexene when treated with $$CH_{3}O^{\circleddash }$$ in $$CH_{3}OH$$ gives
  • 3- hexyne
  • 2-hexyne
  • 2,3-hexadiene
  • 2,4-hexadiene
Which of the following is not the property of benzene?
  • Characteristic smell
  • Inflammable
  • Addition reactions
  • Colourless
Which of the following have only 2 types of H-atom?

128509_00811b6932204441919df735777925a8.png
  • only a 
  • a, b and d
  • a, c and d
  • All of them
Which among the following product is formed when ethyne undergoes hydration?
  • Formaldehyde
  • Formic acid
  • Acetaldehyde
  • Acetic acid

 Heating many alkyl chlorides or bromides in water effects their conversion into alcohol through a $$\displaystyle S_{N}1$$ reaction. Order of the above sets compounds with respect to solvolytic reactivity is :
152526.png
  •  II > I>III
  • III < II < I
  • III > II > I
  • None

The correct order of rate of Wurtz reaction is:
128878_d48cabb7df144b67ac8c154efa08a9af.png
  • $$\displaystyle I > II > III> IV$$
  • $$\displaystyle II > I > III> IV$$
  • $$\displaystyle IV > III > II> I$$
  • In all, the rate of Wurtz reaction is same.
Methanides are:
  • $$Mg_2C_3, Be_2C, Al_4S_3$$ and $$CaC_2$$
  • $$Mg_2C_3, Be_2C$$ and $$Al_4C_3$$
  • $$Be_2C, Al_4C_3$$ and $$CaC_2$$
  • $$Be_2C$$ and $$Al_4C_3$$
Which of the following is methanide?
  • $$Be_2C$$
  • $$CaC_2$$
  • $$Mn_3C$$
  • $$Mg_3C_2$$
The compound which is insoluble in cold, conc. $$H_{2}SO_{4}$$ is:
  • n-hexane
  • $$1$$-hexene
  • $$2$$-hexene
  • ethyl acetate
The discovery that chlorofluorocarbons initiate a radical -chain reaction that catalytically destroys ozone won the 1995Nobel prize in chemistry Given the initiation step below which of the following reactions is the most likely to serve as one of the propagation steps?
$$CCl_{2}F_{2}+hv\rightarrow ^{*} CClF_{2}+^{*}Cl$$
  • $$^{* }Cl+^{* }Cl\rightarrow Cl_{2}$$
  • $$^{*}Cl+O_{3}\rightarrow ^{*}OCl+O_{2}$$
  • $$^{*}CClF_{2}+^{*}Cl \rightarrow CCl_{2}F_{2}$$
  • $$2^{*}CClF_{2}+2O_{3}\rightarrow 2COF_{2}+Cl_{2}+2O_{2}$$
 Which of the following is soluble in methanol:
I : Hexane      
II : Cyclohexane       
III : $$2-methyl pentane$$      
IV : Chloroethane
  • $$I$$
  • $$IV$$
  • $$II$$
  • $$III$$
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