CBSE Questions for Class 11 Medical Chemistry Hydrocarbons Quiz 10 - MCQExams.com

The most important method to prepare lower hydrocarbon is 
  • cracking
  • Sabatier-Senderen's reaction
  • heating salts of fatty acids with sodalime
  • direct synthesis
Ethane can be prepared by
  • heating sodalime with sodium acetate
  • electroysis of sodium succinate
  • electroysis of sodium acetate
  • all of these
Action of heat on a mixture of sodium propanoate and sodalime produces
  • methane
  • ethane
  • propene
  • ethylene
The IUPAC name of neo-pentane is:
  • $$2-$$ methyl butane
  • $$2,2-$$ dimethyl butane
  • $$2-$$ methyl propane
  • $$2,2-$$ dimethyl propane
Aluminium amalgam used as a reducing agent, is obtained by: 
  • dipping aluminium foil in mercuric chloride solution
  • mixing aluminium powder with mercury
  • mixing aluminium nitrate with mercuric oxide
  • adding mercury to aluminium chloride solution
X is heated with sodalime and gives ethane. X is: 
  • ethanoic acid
  • methanoic acid
  • propanoic acid
  • either (a) or (c)
Which of the following is an appropriate set of reactants for the preparation of 1-methoxy-4-nitrobenzene ?
1720006_2042f22458234ccaac8d8c6a2775a5d5.JPG
  • both A and B
  • only A
  • only B
  • none of these
It is necessary to use ______ in the iodonation of alkane.
  • alcohol
  • oxidising agent
  • benzene
  • reducing agent
Alkenes can be prepared by:
  • Dehydrohalogenaion of alkyl halide
  • Sabatier-Sanderen's reduction of alkynes
  • Dehydration of alcohols with $$conc.H_{2}SO_{4}$$ at $$443\ K$$
  • Treatment of $$3^{\circ}$$ alkyl halide at $$573K$$
The compound having only primary hydrogen atoms is: 
  • butane
  • iso-butene
  • cyclohexane
  • $$2,3-$$ dimethylbutene
On mixing certain alkane with chlorine and irradiating it with ultraviolet light, it forms only one monochloro alkane. The alkane could be: 
  • propane
  • pentane
  • iso-pentane
  • neo-pentane
State, whether the following statements are True or False:
Benzene is an unsaturated hydrocarbon and it shows addition reactions like alkenes.
  • True
  • False
State, whether the following statements are True or False:
Benzene has a planar structure.
  • True
  • False
Carbon-carbon bond distance in benzene is
  • Longer than a $$C = C$$ double bond
  • Shorter than a $$C = C$$ double bond
  • Shorter than a $$C = C$$ triple bond
  • Longer than a $$C - C$$ single bond
The benzene molecule is
  • Trigonal
  • Tetrahedral
  • Planar
  • Pyramidal
The centric formula of benzene was proposed by
  • Dewar
  • Baeyer and Armstrong
  • Ladenbarg
  • Kekule
The number of sigma and pi bonds in benzene molecule is
  • $$6\sigma$$ and $$6\pi$$
  • $$12\sigma$$ and $$3\pi$$
  • $$6\sigma$$ and $$9\pi$$
  • $$9\sigma$$ and $$3\pi$$
Which gives only monosubstituted product?
  • o-Dinitrobenzene
  • m-Dinitrobenzene
  • p-Dinitrobenzene
  • Nitrobenzene
The carbide which gives propyne on hydrolysis:
  • $$Al_4C_3$$
  • $$Mg_2C_3$$
  • $$B_4C$$
  • $$La_4C_3$$
The carbon-carbon bond length in benzene is:
  • Same as in $$C_{2}H_{4}$$
  • In between $$C_{2}H_{6}$$ and $$C_{2}H_{2}$$
  • In between $$C_{2}H_{6}$$ and $$C_{2}H_{4}$$
  • In between $$C_{2}H_{4}$$ and $$C_{2}H_{2}$$
STATEMENT-1 :  Alkanes float on the surface of water.
STATEMENT-2 : Density of alkanes is in the range of $$0.6 - 0.9\ g/ml$$, which is lower than water. 
  • Statement -1 is True, Statement-2 True; Statement-2 is a correct explanation for Statement-1.
  • Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1
  • Statement-1 is True, Statement-2 is False
  • Statement-1 is False, Statement-2 is True
IUPAC name of the compound
1761013_788aef9c6d07472f87b1e882da9600a4.png
  • 4-isopropyl-1-6-methyl octane
  • 3-methyl-5-(1-methylethyl) octane
  • 3-methyl-5-isopropyl octane
  • 3-methyl-4-(1-methylethyl ) octane
A hydrocarbon $$(R)$$ has six membered ring in which there is no unsaturation. Two alkyl groups are attached to the ring adjacent to each other. One group has $$3$$ carbon atoms with branching at $$1 ^{ st }$$ carbon and another has $$4$$ carbon atoms. The larger alkyl group has main chain of three carbon atoms of which second carbon is substituted. Correct IUPAC name of compound $$(R)$$ is
  • $$1-$$($$1-$$Methylethyl)$$-2-$$($$1-$$methylpropyl)cyclohexane
  • $$1-$$($$2-$$Methylethyl)$$-2-$$($$1-$$methylpropyl)cyclohexane
  • $$1-$$($$1-$$Methylethyl)$$-2-$$($$2-$$methylpropyl)cyclohexane
  • $$1-$$($$1-$$Methylethyl)$$-2-$$butylcyclohexane
Which does not show substitution in benzene ring?
  • $$ClSO_{3}H$$
  • $$Conc. H_{2}SO_{4}$$ on heating
  • $$Conc. HCl$$
  • $$CH_{3}Cl/ AlCl_{3}$$
Total number of isomers of a disubstituted benzene compound is 
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
Name of the compound given is 
1761024_0196e6b20d8e4d439231372d8d532b09.png
  • 5-ethyl-6-methyloctane
  • 4-ethyl-3-methyloctane
  • 3-methyl-4-ethyloctane
  • 2, 3-diethylheptane
Chlorobenzene is
  • Less reactive than benzyl chloride
  • More reactive than ethyl bromide
  • Nearly as reactive as methyl chloride
  • More reactive than isopropyl chloride
The IUPAC name of the compound is 
1761019_54e16be1f0ff40868f4506e43c881e13.png
  • 3, 3-dimethyl-1-cyclohexanol
  • 1,1-dimethyl-3-hydroxy cyclohexane
  • 3,3-dimethyl-1-hydroxy cyclohexane
  • 1, 1-dimethyl-3-cyclohexane
$$CH_3 - CH_2 - CH_2Br + KOH (alc.) \rightarrow $$  Product Product in above reaction is
  • $$CH_3 - CH = CH_2$$
  • $$CH_3 - CH_2 - CH_3$$
  • (a) and (b) both
  • None of these
Which of the following compound has maximum boiling point?
  • $$n-$$ hexane
  • $$n-$$ pentane
  • $$2, 2-$$ dimethyl propane
  • $$2-$$ methyl butane
Which of the following has maximum boiling point?
  • iso-octane
  • $$n-$$ octane
  • $$2, 2, 3, 3-$$ tetramethyl butane
  • $$n-$$ butane
The IUPAC name of compound is
1761599_9a75db6fa686499dbc6411698826fcee.png
  • $$(2Z, 4Z)-2,4-$$hexa di-ene
  • $$(2Z, 4E)-2,4-$$hexa di-ene
  • $$(4Z, 4Z)-2,4-$$hexa di-ene
  • $$(2E, 4Z)-2,4-$$hexa di-ene
  • $$(2E, 4E)-2,4-$$hexa di-ene
Benzene reacts with chlorine to form benzene hexachloride in presence of
  • Nickel
  • $$AlCl_3$$
  • Bright sunlight
  • Zinc
The propene reacts with $$HBr$$ to form
  • Ethane
  • Hexane
  • 1-bromo-propane
  • 2-bromopropane
Which is not found in alkenes?
  • Chain isomerism
  • Geometrical isomerism
  • Metamerism
  • Position isomerism
Which of the following statements is incorrect
  • $$C_2H_5Br$$ reacts with alco. $$KOH$$ to form $$C_2H_5OH$$
  • $$C_2H_5Br$$ when treated with metallic sodium gives ethane
  • $$C_2H_5Br$$ when treated with sodium ethoxide forms diethyl ether
  • $$C_2H_5Br$$ with $$AgCN$$ forms ethyl isocyanide
The correct structure of benzene was proposed by
  • Faraday
  • Davy
  • Kekule
  • Wohler
The $$C-H$$ bond length is minimum in the bond formed by
  • $$sp - s$$ overlapping (as in alkynes)
  • $$sp^{2} - s$$ overlapping (as in alkynes)
  • $$sp^{3}$$ overlapping (as in alkanes)
  • None of these
As the number of carbon atoms in a chain increases the boiling point of alkanes
  • increases
  • decreases
  • remains same
  • may increase or decrease
$$CH\equiv CH\xrightarrow[Pressure]{Ni(CN)_{2}}X$$. Here X in the reaction
  • Benzene
  • Ethane
  • Cyclooctatetraene
  • Cyclohexane
Which alkene is formed from the following reaction $$ CH_3CH_2CH_2CH = PPh_3 + 2$$ - Butanone 
  • $$3$$-Methyl -$$3$$-heptene
  • $$4$$-Methyl -$$3$$-heptene
  • $$5$$-Methyl -$$3$$-heptene
  • $$1$$-Methyl -$$5$$-methane
Which of the following has acidic hydrogen?
  • Ethyne
  • Ethene
  • Ethane
  • Benzene
By heating a mixture of $$CHCl_3$$ with silver powder , the compound formed is
  • Acetylene
  • Silver acetate
  • Methanol
  • None of these
Methyl chloride reacts with silver acetate to yield
  • Acetaldehyde
  • Acetyl chloride
  • Methyl acetate
  • Acetic acid
The number of possible isomers of butene are
  • $$3$$
  • $$2$$
  • $$4$$
  • $$5$$
  • $$6$$
Which of the following is not aromatic?
  • Benzene
  • Naphthalene
  • Pyridine
  • $$1,3,5-$$ heptatriene
Benzene shows
  • Substitution
  • Addition
  • Oxidation
  • All of these
Silver acetylide when heated with $$HCl$$ gives ?
  • $$C_2H_2$$
  • $$H_2$$
  • $$C_2H_4$$
  • None of these
The reagent which is used to distinguish between propene
and propyne is
  • Bromine
  • Alkaline $$KMnO_{4}$$
  • Ammoniacal $$AgNO_{3}$$
  • Ozone
Which kind of isomerism will butene$$-2$$ show?
  • Geometrical
  • Optical
  • Position
  • None of these
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