CBSE Questions for Class 11 Medical Chemistry Hydrocarbons Quiz 6 - MCQExams.com

Ethyne, on reaction with chlorine consequently, forms :
  • dichloro methane
  • trichloro ethene
  • dichloro ethane
  • tetrachloro ethane
Ethylidene dichloride is obtained by the reaction of excess of HCl with.
  • Ethylene
  • Acetylene
  • Propane
  • Methane
IUPAC name of given compound is :
475245_79a072b8feb64418a5b766892cdbe440.png
  • $$3-$$Ethyl$$-4, 4-$$dimethyl hexane.
  • $$4-$$Ethyl$$-3, 3-$$dimethyl hexane.
  • $$3, 4-$$Diethyl$$-4-$$methyl pentane.
  • $$2-$$Methyl$$-2, 3-$$diethyl pentane.
Dehydrohalogenation of an alkyl halide is a / an:
  • Nucleophilic substitution reaction
  • Elimination reaction
  • Both nucleophilic substitution and elimination reaction
  • Rearrangement
Ethyne is normally prepared by the pyrolysis of:
  • methyne
  • alcohol
  • methane
  • carboxylic acid
 Which of the following molecules has the strongest carbon-to-carbon bond?
  • $$C_2H_2$$
  • $$C_2H_4$$
  • $$C_2H_6$$
  • $$C_3H_8$$
  • $$C_4H_{10}$$
$$C_{7}H_{8} \xrightarrow {3Cl_{2}, Heat} A\xrightarrow {Fe/ Br_{2}} B\xrightarrow {Zn/ HCl} C$$
Here, the compound $$C$$ is:
  • 3-bromo-2,4,6-trichlorotoluene
  • o-bromotoluene
  • p-bromotoluene
  • m-bromotoluene
Secondary butyl chloride will undergo alkaline hydrolysis in the polar solvent by the mechanism
  • $${S}_{N}2$$
  • $${S}_{N}1$$
  • $${S}_{N}1$$ and $${S}_{N}2$$
  • None of the above
Which is an important raw material in the chemical industry to produce polyethyelene?
  • acetylene
  • ethyne
  • both a and b
  • none of the above
The loss of  _____  and _______ atoms from the double-bonded carbon atoms leads to alkyne formation.
  • oxygen, halogen
  • hydrogen, halogen
  • oxygen, hydrogen
  • carbon, halogen
$$CH_3-CBr_2-CBr_2CH_3+2Zn\rightarrow$$
  • $$CH_3-C\equiv C-CH_3$$
  • $$CH_3-C\equiv C-CH_2Br$$
  • $$CH_3-CBr\equiv C-CH_3$$
  • $$CH_2-C\equiv C-CH_3$$
The structure of the third member of the alkyne series is:
  • $$H-C\equiv C - H$$
  • $$H-C\equiv C - CH_{3}$$
  • $$H-C\equiv C - CH_{2}CH_{3}$$
  • $$H-C\equiv C - C\equiv C - H$$
  • $$H-C - C - CH = C - H_{2}$$
Which of the following is true about the given reaction?
764737_69dbbcafaa9543b4bacd6b11e50c3d6e.png
  • The above reaction is of iodination
  • $$HNO_{3}$$ acts as reducing agent in the reaction
  • Iodine cation is electrophile of the reaction
  • The reaction involves electrophilic aromatic substitution
Which of the following describes the nature of aromatic hydrocarbons?
I. $$\displaystyle H-\overset{\overset{\displaystyle H}{|}}{\underset{\underset{\displaystyle H}{|}}{C}}-OH$$

II. $$\displaystyle H-\overset{\overset{\displaystyle H}{|}}{\underset{\underset{\displaystyle H}{|}}{C}}-C\equiv C-H$$.
  • I only
  • III only
  • I and II only
  • II and III only
  • I, II and III
Statement 1: The double and single bonds in benzene are subject to resonance.
Statement 2: Benzene has de-localized pi electrons that stabilize its structure

  • Both Statement 1 and Statement 2 are correct and Statement 2 is the correct explanation of Statement 1.

  • Both Statement 1 and Statement 2 are correct and Statement 2 is not the correct explanation of Statement 1.

  • Statement 1 is correct but Statement 2 is not correct.

  • Statement 1 is not correct but Statement 2 is  correct.

  • Both the Statement 1 and Statement 2 are not correct.

In a series of liquid hydrocarbons, a sample of the diagramed compound would be best identified by which of the following?
ViscosityCapillary Action
AHighHigh
BHighLow
CLowHigh
DLowLow

529451_96def4bbb5f74e58bc328437c9210d6d.png
  • A
  • B
  • C
  • D
Methane can be converted into ethane by :
  • chlorination followed by the reaction with alcoholic $$KOH$$
  • chlorination followed by the reaction with aqueous $$KOH$$
  • chlorination followed by Wurtz reaction
  • chlorination followed by decarboxylation
Which of the following hydrocarbons have the highest boiling point?
  • $$CH_4$$
  • $$C_3H_8$$
  • $$C_4H_{10}$$
  • $$C_5H_{12}$$
  • $$C_6H_{14}$$
The correct structural formula of benzene is :
IUPAC name of the first member of alkyne is ___________.
  • ethene
  • ethyne
  • ethane
  • methane
In the nomenclature of alkenes, if a substituent, double bond and triple bond all are present in the structure  and both multiple bonds are at the same distance from substituent then:
  • the double bond is preferred over triple bond
  • the triple bond is preferred over double bond
  • the substituent is preferred over multiple bonds
  • none of these
The IUPAC name of given compound is:

$$CH_3-C\equiv C-C(CH_3)_2-CH_3$$
  • 4,4-dimethyl-2-heptene-5-yne
  • 4,4-dimethyl-2-heptene-6-yne
  • 4,4-dimethyl-5-heptene-2-yne
  • None of these
Which of the compound does not dissolve in concentrated $$H_2SO_4$$?
  • Hexane
  • Benzene
  • Ethylene
  • Aniline
Which one of the following is the most important halogen in terms of preparation of halogen derivatives of alkane?
  • Bromine 
  • Chlorine
  • Iodine 
  • Fluorine
Give IUPAC name of the following compound :
$$CH\equiv C-C(CH_3)_3$$
  • 3,3- dimethylpropyne
  • 3,3-dimethylbutyne
  • 2,2-dimethylbut-3-yne
  • None of these
The IUPAC name of the compound $$CH\equiv C-CH_2-CH_2-CH=CH_2$$ is:
  • Hex-1-en-5-yne
  • Hexyn-5-ene
  • Hex-5-en-2-yne
  • Hex-5-en-1-yne
s-Butyl bromide is allowed to react with sodium in dry ether, The major product formed is :
s-Butyl bromide is allowed to react with sodium in dry ether.The major product formed is :
Which of the following can be used for the preparation of propane?
  • $$ CH_3 CH \equiv CH_2 \xrightarrow [(ii)\ AgNO_3 /NaOH ] { (i)\ B_2 H_6 } $$
  • $$ CH_3 CH_2 CH_2 Cl \xrightarrow [(ii)H_2O_2]{(i)\ Mg / ether} $$
  • $$ CH_3 CH_2 CH_2 I \xrightarrow { HI / 150^{\circ}C} $$
  • $$ CH_3 CH_2 CH_2 COONa \xrightarrow [\triangle]{ NaOH/CaO} $$
Which is not stable at room temperature?
$$CH\equiv CH\xrightarrow [ { Cu }_{ 2 }{ Cl }_{ 2 } ]{ { NH }_{ 4 }Cl } $$ product
Product is:
  • $$Cu-C\equiv C-Cu$$
  • $${CH}_{2}=CH-C\equiv CH$$
  • $$CH\equiv C-Cu$$
  • $$Cu-C\equiv C-{NH}_{4}$$
The complete IUPAC name of the compound:

693597_6ee00d9380c74badb0e9fd3fc5d437ad.png
  • [R]-1-Bromo-1-phenyl ethane
  • [S]-1-Bromo-1-phenyl ethane
  • [E]-1-Bromo-1-phenyl ethane
  • [Z]-1-Bromo-1-phenyl ethane.
The product of the above reaction is
732603_85178d0954c94494b7ea07bb7a03c0c4.png
The bond order of individual carbon-carbon bonds in benzene is:
  • one
  • two
  • between one and two
  • one and two, alternately
How many monochloro structural isomers are expected in free radical monochlorination of $$2-$$methylbutane?
  • $$2$$
  • $$3$$
  • $$4$$
  • $$5$$
  • $$6$$
Among the following reaction(s) which gives tret - butyl benzene as the major product is/are:
$$CH_3 - \underset{CH_3}{\underset{|}{C}H} MgCl + CH_3 - \!\!\!\!\overset{CH_3}{\overset{|}{\underset{\,\,\,\,CH_3}{\underset{|}{C} }}\!\!\!-} \,OH \rightarrow$$ '$$Q$$'
What is 'Q'?
  • Isobutane
  • Isopropane
  • Tert. butyl chloride
  • Propane
The major product of the reaction of 2-butene with alkaline $$KMnO_4$$ solution is 
The reactivity towards the hydrogenation  of the following compounds is :
760049_eada0fbd82034d62a8a4a45c12fee219.png
  • $$I > II > III > IV$$
  • $$II > III > IV > I$$
  • $$III > IV > IV > I$$
  • $$IV > III > II >I$$
The major product of acid-catalysed dehydration of Pentan $$-3-ol$$ is:
  • $$Pent-1-ene$$
  • $$2-Methyl-1-butene$$
  • $$Pent-2-ene$$
  • $$3-Methyl-1-butene$$
Arrange the given alkenes in decreasing order of their reactivity towards bromination:
765695_07d35783198a458b9e9b1e9d2e98b7fc.png
  • i> ii> iii> iv
  • iv> iii> ii> i
  • i> ii> iv> iii
  • iii> iv> ii> i
Which of the following compounds is insoluble even in hot concentrated $$H_{2}SO_{4}$$?
  • Benzene
  • Hexane
  • Aniline
  • Ethylene
$$CH\ \equiv \ CH\ \xrightarrow [ Ni{ \left( CN \right)  }_{ 2 } ]{ Pressure } X$$. Here $$X$$ in the reaction.
  • Benzene
  • Ethane
  • Cycloctatetraene
  • Cyclohexane
What is $$A$$ ?
789504_c251fa788cb749c287538d04adc4b912.png
In commercial gasolines the type of hydrocarbons which are more desirable, is:
  • Branch hydrocarbon
  • Straight chain hydrocarbon
  • Automatic hydrocarbon such as toluene
  • Linear unsaturated hydrocarbon
Ethyl benzene react with $$BH_{2}/ FeBr_{3}$$ to give:
$$Ph - C \equiv C - CH_3 \xrightarrow[]{Hg^{2+}/H^+}A$$
The product A is:
$$CH_3-C\equiv C$$ MgBr can be prepared by the reaction of _________.
  • $$CH_3-C\equiv C-Br$$ with $$MgBr_2$$
  • $$CH_3-C\equiv CH$$ with $$MgB_2$$
  • $$CH_2-C\equiv CH$$ with KBr and Mg metal
  • $$CH_3-C\equiv CH$$ with $$CH_3MgBr$$
On monochlorination of $$2-methylbutane$$, the total number of chiral compounds formed is:
  • $$2$$
  • $$4$$
  • $$6$$
  • $$8$$
$$CH_{3} - CH_{2} - CH_{2} - CH_{2} - \underset {\underset {CH_{2}}{\parallel}}{C} - CH_{2} - CH_{2} - CH_{3}$$.
  • $$2-propylhex-1-ene$$
  • $$2-butylpent-1-ene$$
  • $$2-propyl-2-butylethene$$
  • $$propyl-1-butylethene$$
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