CBSE Questions for Class 11 Medical Chemistry Hydrocarbons Quiz 1 - MCQExams.com

Acetylene reacts with excess of hypochiorous acid to produce
  • Acetylene tetrachloride
  • Acetylene chlorohydrin
  • Acetaldehyde
  • Dichloroacetaldehyde.
In which case butane is formed ?
  • $$ 2C_2H_5 -CI+Na $$
  • $$ C_2H_5COOH+Na_2CO_3 $$
  • $$ { CH }_{ 3 }{ CH }_{ 2 }\overset { \overset { O }{ || } }{ C } -OH+H_{ 2 }O$$
  • $$ CH_2=CH_2+H_2SO_4 $$
$$CH_3CH=CH-CH_2-CO_2H\xrightarrow[\Delta]{}(X) $$ (major); Product (X) is :
  • $$CH_3CH=CH-CH_3$$
  • $$CH_3-\underset{\,\,\,\,CH_3}{\underset{|}{C}}=CH_2$$
  • $$CH_3-CH_2-CH=CH_2$$
  • $$CH_3-CH=CH_2$$
Electromagnetic radiation with maximum wavelength is
  •  ultraviolet
  • radio waves
  •  x-rays
  • infrared
$$IUPAC$$ name of the following compound is:
1485872_8685f67100e444f6b456eb380e06a63b.PNG
  • 4 - ethyl - 7 methyl nonane
  • 3,3, 4- trimethyl - 7- ethyl decane
  • 3 - propyl - 7 - methyl octane
  • 7- ethyl- 3,3, 4- trimethyl decane
Which of the following alkane gives only two mono chloro-derivatives? 
  • propane
  • n-butane
  • isobutane
  • All
Alkanes can be obtained by the hydrolysis of 
  • $$
    \mathrm{CaC}_{2}
    $$
  • $$
    \mathrm{Mg}_{2} \mathrm{C}_{3}
    $$
  • $$
    \mathrm{Be}_{2} \mathrm{C}_{3}
    $$
  • $$
    \mathrm{Al}_{4} \mathrm{C}_{3}
    $$
Methane is obtained from among the following:
  • $$A{ l }_{ 4 }{ C }_{ 3 }$$
  • $$Be_{ 2 }{ C }$$
  • $${ Mg }_{ 2 }{ C }_{ 3 }$$
  • Both A and B
When the given compound undergoes Hoffmann methylation, the major product of the reaction:
Which of the following is not a pair of isomers:
  • Propyne and Cyclopropene
  • Propyne and Propadiene
  • Propene and Cyclopropene
  • $$1$$ - Propanol and Methoxy ethane
The molecular formula of Ethyne is ______
  • $$C_3H_6 $$
  • $$C_2H_4$$
  • $$C_2H_2$$
  • $$C_2H_6$$
Rank the following substances in decreasing order of heats of combustion ( most exothermic $$ \rightarrow $$east exothermic)
1545098_b33c54b8b0214897ba8a690063e9975b.PNG
  • 2 > 1> 3
  • 2 > 3 >1
  • 3 > 1 > 2
  • 3 > 2 > 1
The smallest possible alkane with ethyl group as substituent possess molecular mass 
  • 16
  • 72
  • 84
  • 100
The product of the following reaction is
1560505_55d3e0a40dd645d782808229d5b39034.png
An alkane $${ C }_{ 7 }{ H }_{ 16 }$$ is produced by the reaction of lithium di(3-pentyl) cuprate with ethyl bromide. The alkane produced is
  • 3-methylhexane
  • 2-ethylpentane
  • heptane
  • 3-ethylpentane
  • 2-methylpentane
Meso - dibromobutane on debromination gives 
  • Trans -2-butene
  • Cis-2-butene
  • 1 - Butene
  • 1 - Butyne
Compound having open chain is-
  • Pentane
  • Isopentane
  • Neopentane
  • All of the above
Number of monochloroderivatives formed on chlorinating n-butane is 
  • 1
  • 2
  • 3
  • 4
On disubstitution of propane with chlorine, gives _____ number of possible products 
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
IUPAC name of the compound shown above is:
1515582_7c09ba22832f465f85b4d6e48573a1bb.PNG
  • 3,3-Bis(1,1-dimethylethyl) pentane
  • 3,3-Bis(isopropyl)pentane
  • 3-Ethyl-3-isopropyl-2,2-dimethyl pentane
  • 3,3-Diethyl-2,2,4 4-tetramethyl pentane
Which of the following reaction will not give methane?
  • $$\mathrm { CH } _ { 3 } \mathrm { COONa } \frac { \mathrm { NaOH } + \mathrm { CaO } } { \Delta }$$
  • $$\mathrm { BeC } _ { 2 } + \mathrm { H } _ { 2 } \mathrm { O } \stackrel { \Delta } { \longrightarrow }$$
  • $$\mathrm { Al } _ { 4 } \mathrm { C } _ { 3 } + \mathrm { H } _ { 2 } \mathrm { O } \stackrel { \Delta } { \longrightarrow }$$
  • All of these
What is degree of  unsaturation ?
1615635_2d85de3c3fc541de96c0d8da9cfd8057.png
  • 8
  • 7
  • 10
  • 9
A and B are -
1563765_b1de682637ba4f8a9fdb52be92eb5614.PNG
  • alcoholic KOH and $$NaNH_{2}$$
  • $$NaNH_{2}$$ and alcoholic KOH
  • $$NaNH_{2}$$ and Lindlar
  • Lindlar and $$NaNH_{2}$$
$$CH_3CH_2CH_3 \xrightarrow[hv]{Cl_2} \underset {(monochlorination\, product)}{A+B}$$

The approximate ratio of percentage yields of A and B formed in the above reaction is:
  • $$56:44$$
  • $$72:28$$
  • $$50:50$$
  • $$75:25$$
Wet ether is not used as a solvent in Wurtz reaction because of the water present in it_____________.
  • hydrolyses RX to ROH
  • reduces RX to RH
  • oxidize RX to RH
  • reacts with R-R
C- H bond type in benzene is:
  • $$\sigma$$ $$sp-s$$
  • $$\sigma$$ $$sp^{2}-s$$
  • $$\sigma$$ $$sp^{3}-s$$
  • $$\sigma$$ $$ p-p$$
Common name of alkenes is :
  • Olefins
  • Paraffins
  • Acetylene
  • Arenes
R in RMgX is :
  • $${ C }_{ 3 }{ H }_{ 7 }$$
  • $$C{ H }_{ 3 }$$
  • $${ C }_{ 2 }{ H }_{ 5 }$$
  • $${ C }_{ 4 }{ H }_{ 9 }$$
Product (C) obtained in the above reaction sequence is
1578758_c37b13ca5501482ab67b971d26b9850c.PNG
  • Mixture of n-butane, ethane
  • Only propane
  • Only ethane
  • n-hexane
The major product $$X$$ and $$Y$$ in the following sequence of transformations are: 
1688514_57f9ebd39b5747aabba930ca2e283f84.png
A mixture of $$1-chlorobutane$$ and $$2-chlorobutane$$ when treated with alcoholic $$KOH$$, gives:
  • $$1-butene$$
  • $$2-butene$$
  • Isobutylene
  • a mixture of $$1-butene$$ and $$2-butene$$
Among the following the number of aromatic compound(s) is/are:
1582897_1f1e2e92b640441cbde1e2a10a77f529.PNG
  • 2
  • 4
  • 1
  • 3
The IUPAC name of the following compound is:
868143_033a6d3c7fd54db3bf451c5652e091bb.png
  • $$3$$-ethyl-$$4$$-methylhex-$$4$$-ene
  • $$4, 4$$-diethyl-$$3$$-methylbut-$$2$$-ene
  • $$4$$-Ethyl-$$3$$-methylhex-$$2$$-ene
  • $$4$$-methyl-$$3$$-ethylhex-$$4$$-ene
IUPAC name of the compound is:

244381_a7e1175065114832bec6fb9db7bd018a.PNG
  • 2,2,3-Trimethyl hexane
  • 2-propyl -3,3-dimethyl butane
  • 2,2 dimethyl -3-methyl butane
  • 2-propyl 3,3-dimethyl hexane
In the reaction, $$CH_{3}COOH\xrightarrow{LiAlH_{4}}A\xrightarrow{PCl_{5}}B\xrightarrow{Alc.KOH}C,$$ the product $$C$$ is:
  • Ethylene
  • Acetyl chloride
  • Acetaldehyde
  • Acetylene
The compound $$Y$$ is:
Cyclohexene is best prepared from cyclohexanol by which of the following?
  • Conc. $$H_3PO_4$$
  • Conc. $$HCl/ ZnCl_2$$
  • Conc. $$HCl$$
  • Conc. $$HBr$$
A fuel has the same knocking property as a mixture of 70% iso-octane (2, 2, 4-trimethylpentane) and 30% n-heptane by volume. The octane number of the fuel is:
  • 100
  • 70
  • 50
  • 40
A compound X is obtained by the reaction of alkaline $$KMnO_3$$ with another compound Y followed by acidification. Compound X also reacts with compound Y in presence of few drops of $$H_2SO_4$$ to form a sweet smelling compound Z. The compound X, Y and Z are respectively.
  • Ethanol, Ethene, Ethanoic acid
  • Ethanoic acid, Ethanol, Ethylethanoate
  • Ethanoic Acid, Ethanal, Ethene
  • Ethanol, Ethanoic Acid, Sodium Ethanoate
When chloro-benzene reacts with sodium in presence of ether than the major product formed is.
which compound is geometrical isomers showing 
  • methane
  • ethane
  • 1 butane 
  •  2-butene
The IUPAC name of $$H_{3}CH_{2}C-C(CH_{3})_{2}-C\equiv CH$$ is:
  • 3,3 - dimethyl -1- pentyne
  • Propyne
  • Butyne
  • 2-pentyne
Choose the correct IUPAC name of the following compound from the given-below options
1093542_fb5c7fceb4f741daa51dd61dd19fd2f7.PNG
  • $$3,4-Dimethyl$$  $$Pent-1-ene$$  $$3-Sulphonic Acid$$
  • $$3,4-Dimethyl$$ $$Pent-1-ene$$  $$2- Sulphonic Acid$$
  • $$3 -Methyl$$ $$4-Ethyl$$ $$Pent-1-ene$$  $$3- Sulphonic Acid$$
  • $$None$$ $$of$$ $$the$$ $$above$$
Correct naming of the given compound is:
605809.PNG
  • ethane
  • ethene
  • ethyne
  • 2-ethene
$$CH_3CH_2CH_2CH_3 \, \xrightarrow {Br_2 \, / \, hv}$$
Major product in the above reaction is:
  • racemic mixture
  • meso
  • diastereomers
  • constitutional isomers
Alkane with more boiling point is:
  • $${ C }_{ 2 }{ H }_{ 6 }$$
  • $${ C }_{ 4 }{ H }_{ 10 }$$
  • $${ C }_{ 5 }{ H }_{ 12 }$$
  • $${ C }_{ 6 }{ H }_{ 14 }$$
In which of the following methods, the number of carbon atoms in alkane (forms as a product) is less than that of the parent compound (reactant)?
  • Reduction of alkyl halide
  • Wurtz reaction
  • Decarboxylation of alkali salt of a fatty acid
  • Hydrolysis of Griganard reagent
The energy barrier to free rotation about carbon carbon bond of ethane is about:
  • $${ 30\ kJ\ mol }^{ -1 }$$
  • $${ 3\ kJ\ mol }^{ -1 }$$
  • $${ 3\ kcal\ mol }^{ -1 }$$
  • $${ 40\ kJ\ mol }^{ -1 }$$
Calcium heptane dioate on distillation produces :
  • cyclo hexanal
  • cyclohexene
  • cyclohexanone
  • cyclohexanoic acid
Sodium acetate can be converted to ethane by which of the following method?
  • Wurtz reaction
  • Kolbe's electrolysis
  • Decarboxylation in presence of soda lime
  • Hydrogenation
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