CBSE Questions for Class 11 Medical Chemistry Hydrocarbons Quiz 14 - MCQExams.com


How many plane of symmetry in given molecule (Benzene) ?


1203888_b0bc40546e8e409c9d1301557d2eb989.PNG
  • 3
  • 5
  • 7
  • 9

The correct IUPAC name of the hydrocarbon X:
1340009_a5bd04ea15f14424bcbee9a3de6e980f.PNG
  • 2 - Methyl - 3 -ethyl pentane
  • 3 - Ethyl-2-methyl pentane
  • 3-Isopropyl pentane
  • 1,1-Diethyl-2-methyl propane.
Addition of one equivalent of $$HCl$$ on but-$$1-en-3-yne$$ gives mainly?
  • $$3-$$chlorobut-$$1-yne$$
  • $$3-$$chlorobut-$$1-ene$$
  • $$2-$$chlorobuta-$$1,3-diene$$
  • $$1-$$chlorobuta-$$1,3-diene$$
The gases (B), (C) and (D), respectively are:
1341881_2b745c51e7c54116aaff33456d388c30.PNG
  • $$HC\equiv CH$$, $${ CO }_{ 2 }$$ and $${ H }_{ 2 }$$
  • $$HC\equiv CH$$, $${ H }_{ 2 } $$ and $$CO_{ 2 }$$
  • $$CH_{ 3 }-C\equiv C-CH_{ 3 }$$, $$CO_{ 2 }$$ and $$H_{ 2 }$$
  • $$CH_{ 3 }-C\equiv C-H$$, $$H_{ 2 }$$ and $$CO_{ 2 }$$
$$Al_4C_3 \xrightarrow{Hydrolysis } A \xrightarrow[HNO_3(vapour)]{400^o-479^oc}B$$;
A and B are?
  • $$C_2H_2$$ and $$C_2H_3NO_2$$
  • $$CH_4$$ and $$CH_3NO_2$$
  • $$CH_4$$ and $$CH_3NO_3$$
  • $$C_2H_2$$ and $$CH_3CN$$
The IUPAC name of the compound having the formula $$ Ch \equiv C-CH = CH_2 $$ is 
  • 1-butyn-3-ene
  • but-1-yne-3-ene
  • 1-buten-3-yne
  • 3-buten-1-yne
The number of primary, secondary and tertiary carbons in 3,4-dimethylheptane are respectively 
  • 4, 3 and 2
  • 2, 3 and 4
  • 4, 2 and 3
  • 3, 4 and 2
A and B are-
1360360_d6c13ceb30094e5d805aee168955c151.PNG
  • alcoholic KOH and $${\text{NaN}}{{\text{H}}_{\text{2}}}$$
  • $${\text{NaN}}{{\text{H}}_{\text{2}}}$$ and alcoholic KOH
  • $${\text{NaN}}{{\text{H}}_{\text{2}}}$$ and lindlar
  • Lindlar and $${\text{NaN}}{{\text{H}}_{\text{2}}}$$
$$RCH=CH_{2}$$ can be obtained by:
  • $$R - \overset{O}{\overset{||}{C}} - H$$ and $$(C_{6}H_{5})_{3}P=CH_{2}$$
  • By heating $$RCH_{2}CH_{2}CH_{2}OCOCH_{3}$$
  • By heating $$RCH_2 CH_2 \underset{O}{\underset{\downarrow}{N}} (CH_3)_2$$
  • All of these
$$ { CH }_{ 3 }-{ CH }_{ 2 }-OH\xrightarrow [  ]{ PCC } A\xrightarrow [ OH^{ - } ]{  } B $$
Then 'B' is
  • $$ CH_2 = CH_2 $$
  • $$ CH_3CHO $$
  • $$ CH_3-CH_2-OH $$
  • $$ { CH }_{ 3 }-\overset { \overset { \displaystyle \,\,\,\,\,\, OH }{ | } }{ \underset { \underset {\displaystyle  H }{ | } }{ C } } -CH_{ 2 }-CHO $$
The alkene which will have the lowest heat of hydrogenation value will be 
  • $$(CH_{3})_{2}C=CHCH_{3}$$
  • $$CH_{3}CH_{2}CH_{2}CH=CH_{2}$$
Promination of alkanes is carried in the presence of 
  • $$AlB{r_3}$$
  • $$CaB{r_2}$$
  • $$NaBr$$
  • $$Zn$$
Which of the following has maximum boiling point 
  • $$C_4H_{10}$$
  • $$C_5H_{12}$$
  • $$C_6H_{14}$$
  • $$C_7H_{16}$$
The most volatile compound is 
  • $$2, 2-$$ dimethyl propane
  • $$2-$$ methyl butane
  • Isobutane
  • $$n-$$ pentane

Which of the following has the maximum melting point?
  • $$C_4H_{10}$$
  • $$C_5H_{12}$$
  • $$C_6H_{14}$$
  • $$C_7H_{16}$$
 Major product "P" obtained in the given reaction is:
1364128_62f8d5fc1370449ca2b540ebbd17d391.GIF
Propane $$\xrightarrow{{Dehydrogenation}}$$ A+B  Major product 'A' is
  • Propene
  • Ethene & methane
  • Propene & $${H_2}$$ gas
  • $${H_2}$$ gas
Catalytic hydrogenation of the above compound produces saturated hydrocarbon(s). The number of stereoisomers formed is 
1382226_57857af61f224aadb9b2c5cc630e15e7.png
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
During halogenation of methane, methylene dichloride reacts with chlorine to form:
  • trichloro methane
  • chloro methane
  • tetra chloro methane
  • dichloro methane
Compound  P is
1382882_20105cd28993497f9f7cbc098bac2261.png
What type of bonding is most important in $$\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 3 }$$?
  • ionic
  • hydrogen
  • covalent
  • polar
The given compounds show______isomerism.
1439027_6332ec030a6c444fa8b20ce41225daf0.png
  • Chain
  • Position
  • Functional
  • None of these
An alkyne on reaction with alk. and subsequent acidiflcation with HCl yields mixture of 
The alkyne is-
1437405_8b505c11004d46ef896d8df59911ca5f.PNG
  • 3-Methyl-Hexyne
  • 2-Methyl -3-hexyne
  • 2-Methyl-2-hexyne
  • 2-Methyl- 2- hexene
Which of the following is the weakest acid?
Which of the following is most stable?
  • $$CH_{4}$$
  • $$CH_{2}= CH_2$$
  • $$HC\equiv CH $$
  • $$CH_{3}-CH = CH_2 $$
In the given structure, the type of carbon atoms present are
1422330_504825a9853743c1bd528b345384211b.JPG
  • One primary, two secondary and one tertiary
  • Four primary, one secondary and two tertiary
  • One primary, one secondary, one tertiary and one quaternary
  • Five primary, one secondary, one tertiary and one quaternary
When water vapours are passed over aluminium carbide, we get:
  • acetaldehyde
  • ethylene
  • methane
  • ethane
A concentrated solution of sodium butyrate is electrolysed, the product obtained at anode is:
  • Butane
  • Propane
  • Hexane
  • Pentane

Identify A.
1396407_f2002469264f41aabd3788a8f68c3992.PNG

Which of the following reagents can be used for above conversion?
1508149_e3ecde126e1445fca3769c48200f7a71.PNG
  • $$Zn$$
  • $$Mg$$
  • $$NaI/acetone$$
  • $$Alc.KOH$$
Neopentyl bromide, undergoes dehydrohalogenaton to give alkenes even though it has no hydrogen. This is due to:
  • $$E_2$$ mechanism
  • $$E_1$$ mechanism
  • Rearrangement of carbocations by $$E_1$$ mechanism
  • $$E_1cB$$ mechanism
  • $$E_1$$ mechanism

The IUPAC name of the given compound is:
1586086_befc84878d7e4942b567e3b5fce213aa.PNG
  • 2,5,6-trimethylheptane
  • 1,3-isopropyl-3-methylpropane
  • 2,6,3-trimethylheptane
  • 2,3,6-trimethylheptane
Which of the following compounds will give the maximum yield of alkane on hydrogenation?
  • $$ H_{2}C=CH_{2}$$
  • $$CH_{3}-CH=CH_{2}$$
The highest boiling point is expected for
  • iso-octane
  • n-octane
  • n-butane
  • neo-heptane
Which among the following carbides on hydrolysis give alkane? 
  • $$Al_{4}C_{3}$$
  • $$CaC_{2}$$
  • $$Be_{2}C$$
  • $$SiC$$
Following are the isomers of molecular formula for $$C_{5}H_{12}$$ : 
Decreasing order of their boiling points is: 
1718045_3f8afb56efd64b9f866b09768b52b2d2.JPG
  • $$I < II < III$$
  • $$I>II>III$$
  • $$II>I>III$$
  • $$III>I>II$$
Product formed in the below reaction is
$$\mathrm{CH_3I +Na \xrightarrow{Dry \ Ether}}$$
  • $$ CH_{4} $$
  • $$ CH_{3}CH_{3} $$
  • $$ CH_{3}-CH_2-CH_2-CH_3 $$
  • $$ CH_{2}C_2H_{5}CH_3 $$
Consider the following reaction,
Identify the structure of major product X:
1719409_9e677b41f41742308366c27b10fd718d.png
Which one of the following statements is wrong?
  • Aromatic compounds are richer in carbon content
  • Aromatic compounds burn with sooty flame
  • Aromatic compounds are generally unstable
  • Aromatic compounds show substitution reactions
The ring structure of benzene was first proposed by:
  • Wohler
  • Faraday
  • Kekule
  • Baeyer
Aqueous solution of which of the following compounds is electrolysed, when acetylene gas is obtained?
  • Sodium fumerate
  • Sodium maleate
  • Sodium acetate
  • Calcium carbide
Which of the following is the correct sequence of steps in the halogenation of an alkane? 
  • Propagation, initiation, termination
  • Initiation, termination, propagation
  • Initiation, propagation, termination
  • Propagation, termination, initiation
In the given reactions:
1719373_ccef9fe2c4304470a79c3a4e384b3094.png
  • A is an aldehyde; B is ketone and C is an alkene
  • A, B and C are alkenes
  • A, B and C are alkanes
  • A and B are alkenes while C is an alkane
Possible products are :
1748006_d6d5249276894a3d8db8d680b7167619.png
Disubstituted derivatives of benzene are of ________ type/ types.
  • $$1$$
  • $$2$$
  • $$3$$
  • $$6$$
The number of $$\pi-electrons$$ in benzene molecule are:
  • $$6$$
  • $$3$$
  • $$5$$
  • $$4$$

1761062_a433031a73ba43349f81140fb0b0bf15.png
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
Benzene gives mainly:
  • Substitution reaction
  • Addition reaction
  • Elimination reaction
  • All of these
$$IUPAC$$ came of $$(CH_3)_2CHCH(CH_3)_2$$ is
  • $$1,1,2,3-$$tertamethylethane
  • $$1,2-$$di-isotropylethane
  • $$2,3-$$dimethylbutane
  • $$2,3,3-$$trimethylbutane
An aromatic compound $$X (C_{9}H_{8}0_{3})$$ turns blue litmus to red. It gives yellow precipitate with $$I_{2}/NaOH$$ and forms $$Y(C_{8}H_{6}O_{4}$$. $$Y$$ forms three mononitro isometric products. Identify $$X$$.
  • None of these
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