Class 11 Chemistry Chapter 12 Organic Chemistry – Some Basic Principles and Techniques MCQ Questions with Answer

Organic Chemistry Class 11 MCQ is one of the best strategies to prepare for the CBSE Class 11 Board exam. If you want to complete a grasp concept or work on one’s score, there is no method except constant practice. Students can improve their speed and accuracy by doing more MCQs on Organic Chemistry Class 11, which will help them all through their board tests.

Organic Chemistry Class 11 MCQ Question with Answer

Class 11 Chemistry MCQ with answers are given here to Chapter 12 Organic Chemistry. These MCQs are based on the latest CBSE board syllabus and relate to the latest Class 11 Chemistry syllabus. By Solving these Class 11 MCQs, you will be able to analyze all of the concepts quickly in the chapter and get ready for the Class 11 Annual exam.

Learn Class 11 Organic ChemistryMCQs with answers pdf free download according to the latest CBSE and NCERT syllabus. Students should prepare for the examination by solving CBSE Class 11 Chemistry Organic Chemistry MCQ with answers given below

Question 1. The absolute configuration of the following

(a) 2S, 3R
(b) 2S, 3S
(c) 2R, 3S
(d) 2R, 3R

Question 2. In laboratory, first organic compound was synthesised by
(a) Kekule
(b) Hennel
(c) Wohler
(d) Liebig

Question 3. Which of the following organic compound was synthesised by F. Wohler from an inorganic compound?
(a) Methane
(b) Urea
(c) Acetic acid
(d) Chloroform

Question 4. The discovery that shook the belief in the vital force theory was
(a) Stereoisomerism
(b) Synthesis of indigo
(c) Wholer’s synthesis of urea from ammonium cyanate
(d) Fermentation of sugars

Question 5. Who is known as the “Father of Chemistry”?
(a) Faraday
(b) Priestley
(c) Rutherford
(d) Lavoisier

Question 6. The percentage of s- character of the hybrid orbitals in ethane, ethene and ethyne are respectively.
(a) 50, 75, 100
(b) 10, 20, 40
(c) 25, 33, 50
(d) 25, 50, 75

Question 7. Which of the following scientist proposed that a ‘vital force’ was responsible for the formation of organic compounds ?
(a) Berzilius
(b) Wohler
(c) Berthelot
(d) Kolbe

Question 8. Which of the following molecules is expected to rotate the plane of plane polarised light?

Question 9. First organic compound to be synthesised was
(a) methane
(b) cane sugar
(c) acetic acid
(d) urea

Question 10. 2- Pentene contains
(a) 15 σ- and one π- bond
(b) 14 σ-and one π- bond
(c) 15 σ- and two π- bonds
(d) 14 σ- and two π- bonds

Question 11. The successive members in a homologues series differ from each other by ________
(a) – CH₂CH₂ ^– unit
(b) – CH₂ unit
(c) – OCH3 unit
(d) – CH₃ unit

Question 12. Tautomerism is exhibited by

Question 13. Select the molecule which has only one π-bond
(a) CH ≡ CH
(b) CH₂ = CHCHO
(c) CH₃CH = CH₂
(d) CH₃CH=CHCOOH

Question 14. In the hydrocarbon CH₃ – CH = CH – CH₂ – C ≡ CH                             
6 5 4 3 2 1

 The state of hybrization of carbons 1, 3 and 5 are in the following sequence 
(a) sp², sp, sp³
(b) sp, sp³, sp²
(c) sp, sp², sp³
(d) sp³, sp², sp

Question 15. Among the following four structures I to IV

it is true that
(a) all fow- are chiral compounds
(b) I and II are chiral compounds
(c) only ill is a chiral compound
(d) IT and IV are chiral compounds

Question 15. The hybridisation of carbon atom in C — C single bond of H₂C = CH — CH = CH₂ is
(a) sp³ — sp
(b) sp² — sp
(c) sp² — sp²
(b) sp³ — sp³

Question 16. The functional group present in organic, acid is –
(a) – OH
(b) – CHO
(c) –COOH
(d) > C = O

Question 17. Which of these contains the carbonyl group?
(a) ketones
(b) aldehydes
(c) esters
(d) all of these

Question 18. Which of the following is incorrectly matched –
(a) vinegar →carboxylic acid
(b) C₂H₆ →alkane
(c) ethanol →alcohol
(d) methanol →ketone

Question 19. Amongst the following compounds, the optically active alkane having lowest molecular mass is

Question 20. The functional group present in CH₃COOC₂H₅ is –
(a) ketonic
(b) aldehydic
(c) ester
(d) carboxylic

Question 21. Which of the following have incorrect molecular formula?
A. Icosane –           C₁₀H₂₂
B. Triacontane –      C₃₀H₆₂
C. Nonane –           C₉H₂0
D. Heptane –          C₇H₁₄
(a) (A) and (D)
(b) Only (D)
(c) (B) and (D)
(d) Only (B)

Question 22. Butanone is a four-carbon compound with the functional group –
(a) carboxylic acid
(b) aldehyde.
(c) ketone
(d) alcohol.

Question 23. The compound, whose stereo-chemical fommla is written below, exhibits x geometrical isomers and y optical isomers The values of x and y are

(a) 4 and 4
(b) 2 and 2
(c) 2 and 4
(d) 4 and 2

Question 24. Which of the following statements is false for isopentane ?
(a) It has three CH₃ groups
(b) It has one CH₂ group
(c) It has one CH group
(d) It has a carbon which is not bonded to hydrogen

Question 25. Geometrical isomerism is possible in
(a) acetone oxime
(b) isobutene
(c) acetophenone oxime
(d) benzophenone oxime   

Question 26. The compound which has one isopropyl group is
(a) 2, 2, 3, 3 – Tetramethylpentane
(b) 2, 2 – Dimethylpentane
(c) 2, 2, 3- Trimethylpentane
(d) 2- Methypentane

Question 27.

Compound can exhibit
(a) geometrical isomerism
(b) tautomerism
(c) optical isomerism
(d) geometrical and optical isomerism

Question 28. In this reaction,
CH₃CHO+HCN → CH₃CH(OH)CN
                            →^H·OH CH₃CH(OH)COOH
an asymmetric centre is generated. The acid obtained would be 
(a) 50% D + 50% L-isomer
(b) 20% D + 80% L-isomer
(c) D-isomer
(d) L-isomer     

Question 29. Which one of the following shows functional isomerism?
(a) C₂H₄
(b) C₃H₆ 
(c) C₂H₅OH
(d) CH₂Cl₂     

Question 30. Ethers are isomeric with
(a) aldehydes
(b) ketones
(c) both aldehydes and ketones
(d) alcohols     

Question 31. Which of the following will have a meso-isomer also?
(a) 2-chlorobutane 
(b) 2, 3-dichlorobutane
(c) 2, 3-dichloropentane
(d) 2-hydroxypropanoic acid     

Question 32. Which of the following compounds is optically active ?
(a) (CH₃ )₂CHCH₂OH
(b) CH₃CH₂OH 
(c) CCI₂F₂
(d) CH₃CHOHC₂H₅       

Question 33. Isomers of prop ionic acid are 
(a) HCOOC₂H₅ and CH₃COOCH₃
(b) HCOOCC₂H₅ and C₃H₇COOH
(c) CH₃COOCH₃ and C₃H₇OH
(d) C₃H₇OH and CH₃COOCH₃       

Question 34. The name of the compound

is
(a) (2Z, 4Z)-2, 4-hexadiene
(b) (2Z, 4E)-2, 4-hexadiene
(c) (2E, 4Z)-2, 4-hexadiene
(d) (4E, 4Z)-2, 4-hexadiene
(e) (2E, 4E)-2, 4-hexadiene

Question 35. Geometrical isomerism is shown by 
(a) —C—C—
(b) C=C
(c) — C- C—
(d) None of these       

Question 36. n-pentane, iso-pentane and neo-pentane are examples for isomers of the type 
(a) geometrical
(b) optical
(c) chain
(d) positional     

Question 37. Different structures generated due to rotation about, C—C axis, of an organic molecule, are examples of 
(a) geometrical isomerism
(b) conformational isomerism
(c) optical isomerism
(d) structural isomerism     

Question 38. Which of the following Fischer’s projection fommla is identical to D-glyceraldehyde?

Question 39. Metamers of ethyl propionate are
(a) C₄H₉COOH and HCOOC₄H₉
(b) C₄H₉COOH and CH₃COOC₃H₇
(c) CH₃COOCH₃ and CH₃COOC₃H₇
(d) CH₃COOC₃H₇ and C₃H₇COOCH₃     

Question 40. Increasing order of stability among the three main conformations, (i.e. Eclipse, Anti, Gauche) of 2-fluoroethanol is 
(a) Eclipse, Gauche, Anti
(b) Gauche, Eclipse, Anti
(c) Eclipse, Anti, Gauche
(d) Anti, Gauche, Eclipse       

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Question 41. How many asymmetric carbon atoms are present in
I. 1,2-dimethylcyclohexane
II. 3-methylcyclopentane and
III. 3-methylcyclohexene ?
(a) Two, one, one
(b) One, one, one
(c) Two, none, two
(d) Two, none, one        

Question 42. For which of the following parameters the structural isomers C₂H₅OH and CH₃OCH₃ would be expected to have the same values? (Assume ideal behaviour)
(a) Heat of vaporisation 
(b) Vapour pressure at the same temperature
(c) Boiling points
(d) Gaseous densities at the same temperature and pressure     

Question 43. Maximun1 enol content is in

Question 44. C₆H₅C = N and C₆H₅N = C exhibit which type of isomerism? 
(a) Position
(b) Functional
(c) Metamerism
(d) Dextro-isomerism     

Question 45. How many isomers are possible for the alkane C₄H₁₀ ?
(a) 3
(b) 5
(c) 2
(d) 4       

Question 46. Geometrical isomerism is possible in case of
(a) pentene-2
(b) propane
(c) pentane
(d) ethene   

Question 47. The number of isomers of the compound with molecular fommla C₂H₂Br₂ is 
(a) 4
(b) 3
(c) 5
(d) 2     

Question 48. The number of primary, secondary and tertiary carbons in 3, 4-dimethylheptane are respectively
(a) 4, 3 and 2
(b) 2, 3 and 4
(c) 4, 2 and 3
(d) 3, 4 and 2

Question 49. The number of primary, secondary, tertiary and quaternary carbons in neopentane are respectively
(a) 4, 3, 2 and 1
(b) 5, 0, 0 and 1
(c) 4, 0, 0 and 1
(d) 4, 0, 1 and 1

Question 50. The number of meso-forms in the following compound is
HOOC- CH(CH₃ )· CH(OH)· CH(Cl)
                 · CH(OH)CH(CH₃ )· COOH 
(a) 3
(b) 4
(c) 8
(d) 16     

Question 51. Which of the following compounds is optically active ?
(a) 1-butanol
(b) Isopropyl alcohol
(c) Acetaldehyde
(d) 2-butanol     

Question 52. The number of secondary hydrogens in 2, 2-dimethylbutane is
(a) 8
(b) 6
(c) 4
(d) 2

Question 53. What is the IUPAC name of t-butyl alcohol.
(a) Butanol–2
(b) 2–Methyl-propan–2-ol
(c) Butanol–1
(d) Propanol-2

Question 54. Which of the following compounds contains 1°, 2°, 3° as well as 4° carbon atoms ?
(a) Neopentane
(b) 2-methyl pentane
(c) 2,3-dimethyl butane
(d) 2,2,3-trimethyl pentane

Question 55. The IUPAC name of neopentane is
(a) 2, 2-dimethylpropane
(b) 2-methylpropane
(c) 2, 2-dimethylbutane
(d) 2-methylbutane

Question 56. The IUPAC name of the compound CH₃ — CH(CH₃) — CO – CH₃, is
(a) 3-methyl 2-butanone
(b) 2-methyl 3-butanone
(c) isopropyl methyl ketone
(d) methyl isopropyl ketone

Question 57. The IUPAC name of CH₃COCH (CH₃)₂ is –
(a) isopropyl methyl ketone
(b) 2-methyl-3-butanone
(c) 4-methylisopropyl ketone
(d) 3-methyl-2-butanone

Question 58. IUPAC name of (CH₃)₃ CCl is
(a) 1-butyl chloride
(b) 3-chloro butane
(c) 2-chloro-2-methylpropane
(d) 2-butyl chloride

Question 59. The IUPAC name of the compound CH₃OCH₂CH₂CH₂OCH₂CH₃ is
(a) 3-ethoxy-1-methoxypropane
(b) 1-ethoxy-3-methoxypropane
(c) 2, 5-dioxyhexane
(d) ethoxypropane oxymethane

Question 60. Which organic structure among the following is not an isomer of the compound CH₃–CO–CH₂CH₂CH₂CH₃ ?
(a) CH₃CH₂OCH =CHCH₂CH₃
(b) CH₃CH = CHCH₂CH₂CHO
(c) (CH₃)₂CH–CO–CH₂CH₃
(d) CH₃CH₂COCH₂CH₂CH₃

Question 61. Total number of structural isomers possible for C₃H₆ are :
(a) 2
(b) 1
(c) 4
(d) 3

Question 62. Which of the following statements is false for isopentane–
(a) It has three CH₃ groups
(b) It has one CH₂ group
(c) It has one CH group
(d) It has a carbon which is not bonded to hydrogen

Question 63. The total number of isomers for C₄H₈ is
(a) 5
(b) 6
(c) 7
(d) 8

Question 64. The least number of carbon atoms in alkane showing isomerism is
(a) 3
(b) 1
(c) 2
(d) 4

Question 65. The number of possible alkynes with molecular formula C₅H₈ is
(a) 2
(b) 3
(c) 4
(d) 5

Question 66. Which of the following compounds is isomeric with 2, 2, 4, 4- tetramethylhexane?
(a) 3-ethyl -2, 2- dimethylpentane
(b) 4-isopropylheptane
(c) 4-ethyl-3-methyl-4-n propyloctane
(d) 4, 4-diethyl-3-methylheptane

Question 67. Isomers of propionic acid are
(a) HCOOC₂H₅ and CH₃COOCH₃
(b) HCOOC₂H₅ and C₃H₇COOH
(c) CH₃COOCH₃ and C₃H7OH
(d) C₃H₇OH and CH₃COCH₃

Question 68. An aromatic compound of formula C₇H₇Cl has in all ….. isomers :
(a) 5
(d) 2
(c) 4
(d) 3

Question 69. CH₃CH₂OH and CH₃OCH₃ are the examples of
(a) chain isomerism
(b) functional isomerism
(c) position isomerism
(d) metamerism

Question 70. In which of the following, functional group isomerism is not possible?
(a) Alcohols
(b) Aldehydes
(c) Alkyl halides
(d) Cyanides

Question 71. Which are isomers ?
(a) ethyl alcohol and dimethyl ether
(b) acetone and acetaldehyde
(c) propionic acid and propanone
(d) methyl alcohol and dimethyl ether

Question 72. C6H5C ≡ N and C6H5N ≡ C are which type of isomers?
(a) Position
(b) Functional
(c) Tautomerism
(d) Linkage

Question 73. A functional isomer of 1-butyne is
(a) 2-butyne
(b) 1-butene
(c) 2-butene
(d) 1, 3-butadiene

Question 74. Methoxyethane and propanol are the examples of isomerism of the type
(a) structural
(b) position
(c) functional
(d) tautomerism

Question 75. The compounds CH₃CH == CHCH₃ and CH₃CH₂CH == CH₂                       
(a) are tautomers           
(b) are position isomers
(c) contain same number of sp³– sp³, sp³– sp² and sp²– sp² carbon-carbon bonds
(d) exist together in dynamic equilibrium

Question 76. The organic reaction which proceed through heterolytic bond cleavage are called ________
(a) ionic
(b) polar
(c) nonpolar
(d) Both (a) and (b)

Question 77. The shape of methyl carbanion is similar to that of –
(a) BF₃
(b) NH₃
(c) methyl free radical
(d) methyl carbocation

Question 78. Heterolytic fission of C – Br bond results in the formation of
(a) free radical
(b) carbanion
(c) carbocation
(d) Both (b) and (c)

Question 79. Which of the following carbocations is least stable?
(a) tert-Alkyl
(b) sec-Alkyl
(c) pri-Alkyl
(d) Methyl

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