CBSE Questions for Class 11 Medical Chemistry Hydrocarbons Quiz 8 - MCQExams.com

Which of the following compound is not suitable to obtain from wurtz reaction?
  • Ethane
  • Butane
  • Isobutane
  • Hexane
Which of the following reactants will yield ethane ?
  • Methyl bromide and sodium
  • Ethyl bromide and magnesium
  • Ethanol and $$H_2SO_4$$
  • Ethyl bromide and KCN
$$H_3C-C\equiv C-CH_3$$ maximum number of linear atoms in given compound is:
  • 4
  • 6
  • 10
  • 8
Which of the following reactions would give isopropyl benzene as the major product?
1058572_dc347afb87f3460685a307e0d7206924.png
  • a, d
  • b, c
  • b, c, d
  • All of these
Arrange the following compounds in increasing order of their reactivity with sodium hydroxide solution: 
  
[o-nitrochlorobenzene, chlorobenzene, benzyl chloride]
  • $$benzylchloride$$ < $$chlorobenzene$$ < $$o-nitrochlorobenezene$$
  • $$chlorobenzene$$ < $$o-nitrochlorobenzene$$ < $$benzyl chloride$$
  • $$chlorobenzene$$ < $$benzyl chloride$$ < $$o-nitrochlorobenzene$$ 
  • $$benzyl chloride$$ < $$o-nitrochlorobenzene$$ < $$chlorobenzene$$ 
The least reactive alkene towards dil. $$HCl$$ is :
  • $$CH_3-CH = CH_2$$
  • $$CH_2 = CH_2$$
Nitration of which of the following compound is difficult?
  • Benzene
  • Nitrobenzene
  • Toluene
  • Phenol
Alkanes having odd carbons cannot be prepared in?

 A) Wurtz reaction
B) Frankland reaction
C) Kolbe's electrolysis
D) Sabatier-sendersen reaction
  • B,C&D
  • A, B & D
  • A, C & D
  • A, B & C
Arrange the following compounds in the descending order of their boiling points

a) n-pentane

b) isopentane

c) neopentane
  • $$c>b>a$$
  • $$a>b>c$$
  • $$b>c>a$$
  • $$c>a>b$$
In the following sequence of reaction 
$$Toluene\xrightarrow [  ]{ KMn{ O }_{ 4 } } A\xrightarrow [  ]{ { SOCl }_{ 2 } } B\xrightarrow [ BaS{ O }_{ 4 } ]{ { H }_{ 2 }/Pd } C$$
the product $$C$$ is:
  • $${ C }_{ 6 }{ H }_{ 5 }COOH$$
  • $$C_{6}H_{5}CH_{3}$$
  • $${ C }_{ 6 }H_{5}{ CH }_{ 2 }OH$$
  • $$C_{6}H_{5}CHO$$
2-Bromopentane is heated with $$EtO^-Na^+$$ in ethanol. The major product obtained is:
  • 2-ethoxypentane.
  • pent-1-ene.
  • isobutane.
  • pent-2-ene.
The number of $${ sp }^{ 2 }$$ - s sigma bonds in benzene are :
  • 3
  • 6
  • 12
  • None of these
Which of the following will allow free rotation about double bond? 
[arrows indicate the bond to be considered]
Which of the following molecules has a triple bond?
  • $${CH}_{4}$$
  • $${C}_{2}{H}_{4}$$
  • $${C}_{2}{H}_{2}$$
  • $${O}_{3}$$
The reaction of $$P_4$$ with aqueous NaOH gives
  • $$P(OH)_3$$
  • $$P_2O_5$$
  • $$P(OH)_5$$
  • $$PH_3$$
$$4.3\ gm$$ of an alkane is burnt in sufficient oxygen. The $${ CO }_{ 2 }$$ formed reacts completely with $$300\ ml, 2N NaOH$$ solution producing $${ Na }_{ 2 }{ CO }_{ 3 }$$. The alkane should be
  • $${ C }_{ 3 }{ H }_{ 8 }$$
  • $${ C }_{ 12 }{ H }_{ 26 }$$
  • $${ C }_{ 6 }{ H }_{ 14 }$$
  • $${ C }_{ 2 }{ H }_{ 6 }$$

Correct IUPAC name of the following compound is :
1155532_f099a9469f7d4ba4a57ebf4c6a92ee8a.png
  • $$4-(1,1-dimethylethyl)-5-ethyloctane$$
  • $$5-ethyl -4-(1,1-dimethylethyl) octane$$
  • $$5-(1,1-dimethylethyl)-4-ethyloctane$$
  • $$4-ethyl-5-(1,1-dimethylethyl) octane$$
Ethylene is formed by dehydration of:
  • $$CH_3CHO$$
  • $$C_2H_5OH$$
  • Propyl alcohol
  • Ethyl acetate
Identify product.
1158499_887709e54fa54ba8bc8092bb8795a644.png
  • $$C_2H_2+2CO_2$$
  • $$2KOH+H_2$$
  • $$2KOH+2CO_2$$
  • $$C_2H_2+H_2$$
Which of the following is aromatic in nature
  • $$All \ of \ these$$
The number of $$sp^2-s$$ sigma bonds is benzene are:
  • 3
  • 6
  • 12
  • none of these
For synthesis of 1 -butene, $$CH_3MgI$$ should be treated with :
  • propene
  • 2 - chloropropene
  • allyl chloride
  • ethyl chloride
$$CH_{3}-C\equiv C-CH_{3}\xrightarrow[Pd+BaSO_{4}]{H_{2}}P\overset{KMnO_{4}/H^{+}}{\rightarrow}Q.$$. here the product Q is 
  • Alkane
  • Alkene
  • Aldehyde
  • Carboxylic acid
Double bond equivalent (degree of unsaturation) of $$(A) $$ is:
1168280_bf329c1d68424c5b9e81c13a6a31c885.png
  • 1
  • 2
  • 3
  • 4
$${ CH }_{ 2 }-CH={ CH }_{ 2 }\xrightarrow { { zn,CH }_{ 3 }OH } product\\ |\quad \quad \quad \quad \quad \quad  |\\ Br\quad \quad \quad \quad \quad  Br$$
The remaining product is ?
  • $${ CH }_{ 2 }=C=C={ CH }_{ 2 }$$
  • $${ CH }_{ 2 }=CH=CH={ CH }_{ 2 }$$

Which are the correct IUPAC name of the following compound ?


1164799_63e370f9fdb0476f954f1d9ce7ea0aef.PNG
  • 5-butyl-4-is isopropyldecane
  • 5-ethyl-4-propyldecane
  • 5-sec-butyl-4-isopropyldecane
  • 4-(1-methylethyl)-5-(1-methylpropyl)decane
The number of possible alkynes with molecular formula $$C_{5}H_{8}$$ is
  • $$3$$
  • $$4$$
  • $$5$$
  • $$6$$
1, 1 -dibromoethane when heated with zine dust produces_____.
  • ethyl bromide
  • ethene
  • vinyl bromide
  • 2 - butene
If two moles of isopropyl chloride reacts with $$Na$$ in presence of dry ether. Which alkane is formed?
  • Hexane
  • 2, 3-Dimethyl butane
  • Isopentane
  • Neopentane
IUPAC name of the given compound is:
1189474_3334da35d0c44e28adef1d95c8e50a21.png
  • 2-Methyl-2, 3-diethyl pentane
  • 4-Ethyl-3, 3-dimethyl hexane
  • 3,4-Diethyl-4-methyl pentane
  • 3-Ethyl-4, 4-dimethyl hexane
The correct IUPAC name of the following alkane is
$$H_3C-CH_2-CH_2-CH_2-CH_2-CH_2-CH_2-CH_3$$
  • 1,6-dimethylhexane
  • Octane
  • Heptane
  • Decane
What is the Possible number of alkadienes with molecular formula $$C_5H_8$$? (Excluding stereoisomers)
  • 4
  • 5
  • 6
  • 2
Ethanol reacts with $$CH_3Mgl$$ gives
  • Ethane
  • Isoproply alcohol
  • Acetaldehyde
  • Methane
Reaction of $$trans-2-phenyl -1-bromocyclopentane$$ on reaction with alcoholic $$KOH$$ produces (major):
  • $$4-phenylcyclopentene$$
  • $$2-phenylcyclopentene$$
  • $$1-phenylcyclopentene$$
  • $$3-phenylcyclopentene$$
An alkane containing atleast_____ carbon atoms is converted into an aromatic hydrocarbon, when heated in presence of $$Cr_{2}O_{3}$$ on $$Al_{2}O_{3}$$
  • $$6$$
  • $$4$$
  • $$3$$
  • $$5$$
The major product (A) is
1255530_8f30b9ced2f446b9b975df68c6f0975a.png

The given pair is an example of:

1262493_b81db6f349ef44aca9f662be035e59c0.png
  • Enantiomers
  • Diasteremers
  • Identical
  • Constitutional isomers
Electrolysis of aq. solution of sodium salt of saturated dicarboxylic acids, give
  • alkyne
  • alkene
  • alkane
  • none of these
In the reaction
$$H-C\equiv CH\dfrac { { NaNH }_{ 2 }/liq.{ NH }_{ 3 } }{ { CH }_{ 3 }{ CH }_{ 2 }Br } X\dfrac { { NaNH }_{ 2 }/liq.{ NH }_{ 3 } }{ { CH }_{ 3 }{ CH }_{ 2 }Br } Y$$ $$X$$ and $$Y$$ are 
  • $$X=1-Butyne ; Y=3-Hexyne$$
  • $$X=2-Butyne ; Y=3-Hexyne$$
  • $$X=2-Butyne ; Y=2-Hexyne$$
  • $$X=1-Butyne ; Y=2-Hexyne$$
The IUPAC name of $$(CH_3)_3C-CH=CH_2$$ is?
  • $$2, 2$$-dimethylbut-$$2$$-ene
  • $$2, 2$$-dimenthylpent-$$3$$-ene
  • $$3, 3$$-dimethylbut-$$1$$-ene
  • Hex-$$1$$-ene
How many optical isomers are possible on monochlorination of $$2-$$methyl butane 
  • $$2$$
  • $$4$$
  • $$6$$
  • $$8$$
How many cyclic and alkene isomers of $$C_4H_8$$ are possible? ( Excluding stereoisomers) 
  • $$3$$
  • $$4$$
  • $$5$$
  • $$6$$
From which one of the following both ethylene and acetylene could be prepared in a single step?
  • $$CH_{3}CH_{2}OH$$
  • $$Br - CH_{2} - CH_{2} - Br$$
  • $$CH_{3}CH_{2}Br$$
  • $$Br - CH = CH_{2}$$
  • $$CH_{3}COOH$$
Identify major product $${{\text{P}}_{\text{3}}}$$:
1304095_5f1e1bb4039a4c85b8231f45b659a45c.JPG
By which of the following reagent butanoic acid is converted into butane 
  • Red P / HI
  • NaOH / CaO
  • $${\text{C}}{{\text{H}}_3}{\text{MgBr}}$$
  • Na/ ether
An alkene of molecular formula $$C_{9}H_{18}$$ on ozonolysis gives 2,2-dimethylpropanal and butan-2-one, then the alkene is
  • 2,2,4-trimethylhex-3-ene
  • 2,2,6-trimethylhex-3-ene
  • 2,3,4-trimethylhex-2-ene
  • 2,2,4-trimethylhex-2-ene
The correct order for acid strength of compounds $$CH\equiv CH, CH_{3}-C \equiv CH$$ and $$CH_{2} = CH_{2}$$ is as follows:
  • $$CH \equiv CH > CH_{2} = CH_{2} > CH_{3} - C \equiv CH$$
  • $$HC\equiv CH > CH_{3} - C \equiv CH > CH_{2} = CH_{2}$$
  • $$CH_{3} - C \equiv CH > CH_{2} = CH_{2} > HC \equiv CH$$
  • $$CH_{3} - C \equiv CH > CH\equiv CH > CH_{2} = CH_{2}$$
$$n$$ propyl alcohol on reacting with anhydrous alumina at $$623\,K$$ forms 
  • Ethane
  • Propene
  • propyne
  • Propane
$${ CH }_{ 3 }{ CH }_{ 2 }{ CH }_{ 3 }\xrightarrow [  ]{ 400-{ 600 }^{ o }C } X+Y$$ $$X$$ and $$Y$$ are 
  • ethylene, ethane
  • Hydrogen, ethylene
  • methane, ethylene
  • Hydrogen, methane

Which of the following does not give alkane with $$R-Mg-X.$$
  • $$Ph-OH$$
  • $$C_6H_6$$
  • $$CH_3COOH$$
  • $$HCl$$
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