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

Please refer to MCQ Questions Organic Chemistry Some Basic Principles and Techniques for Chapter 2 Class 11 Chemistry given below. All MCQ questions are provided with answers. These MCQ Questions for Class 11 Chemistry are designed based on the chapters given in your CBSE NCERT Textbook for Class 11 Chemistry. These MCQ Questions are expected to come in your class 11 Board exams.

Question. 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. 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. The absolute configuration of the following

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

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

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

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

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

Question. 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. Tautomerism is exhibited by

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

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

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

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

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

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

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

Question. 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. 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.

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

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

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

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

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

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

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

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

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

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

Question. 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. 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. Maximun1 enol content is in

Question. 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       

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Organic Chemistry Class 11 MCQ Chapter 12 has been gathered for students to rehearse. Students can prepare this Class 11 Organic Chemistry MCQ. Each question has four choices with answers. Firstly, Solve all these Questions and check your answer with the right answer. If your answers do not match with the right answer, Don’t worry try again because You need to prepare daily to score higher marks in the Class 11 Chemistry Exam.

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