CBSE Class 11 Chemistry Organic Chemistry Some Basic Principles and Techniques MCQs Set A

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

Answer: Berzilius

Question: First organic compound to be synthesised was

a) urea

b) cane sugar

c) methane

d) acetic acid

Answer: urea

Question: Which of the following organic compound was synthesised by F. Wohler from an inorganic compound?

a) Urea

b) Chloroform

c) Methane

d) Acetic acid

Answer: Urea

Question: The discovery that shook the belief in the vital force theory was

a) Wholer’s synthesis of urea from ammonium cyanate

b) Fermentation of sugars

c) Synthesis of indigo

d) Stereoisomerism

Answer: Wholer’s synthesis of urea from ammonium cyanate

Question: In laboratory, first organic compound was synthesised by

a) Wohler

b) Kekule

c) Hennel

d) Liebig

Answer: Wohler

Question: Who is known as the “Father of Chemistry”?

a) Lavoisier

b) Priestley

c) Faraday

d) Rutherford

Answer: Lavoisier

Question: The percentage of s- character of the hybrid orbitals in ethane, ethene and ethyne are respectively

a) 25, 33, 50

b) 50, 75, 100

c) 25, 50, 75

d) 10, 20, 40

Answer: 25, 33, 50

Question: The functional group present in organic, acid is –

a) –COOH

b) – OH

c) – CHO

d) > C = O

Answer: –COOH

Question: Which of these contains the carbonyl group?

a) all of these

b) aldehydes

c) ketones

d) esters

Answer: all of these

Question: Butanone is a four-carbon compound with the functional group –

a) ketone

b) carboxylic acid

c) aldehyde.

d) alcohol.

Answer: ketone

Question: Which of the following compounds contains 1°, 2°, 3° as well as 4° carbon atoms ?

a) 2,2,3-trimethyl pentane

b) 2-methyl pentane

c) Neopentane

d) 2,3-dimethyl butane

Answer: 2,2,3-trimethyl pentane

Question: The number of secondary hydrogens in 2, 2-dimethylbutane is

a) 2

b) 6

c) 8

d) 4

Answer: 2

Question: The compound which has one isopropyl group is

a) 2- Methypentane

b) 2, 2, 3- Trimethylpentane

c) 2, 2 - Dimethylpentane

d) 2, 2, 3, 3 - Tetramethylpentane

Answer: 2- Methypentane

Question: Which of the following statements is false for isopentane ?

a) It has a carbon which is not bonded to hydrogen

b) It has one CH group

c) It has one CH₂ group

d) It has three CH₃ groups

Answer: It has a carbon which is not bonded to hydrogen

Question: The number of primary, secondary and tertiary carbons in 3, 4-dimethylheptane are respectively

a) 4, 3 and 2

b) 4, 2 and 3

c) 2, 3 and 4

d) 3, 4 and 2

Answer: 4, 3 and 2

Question: The number of primary, secondary, tertiary and quaternary carbons in neopentane are respectively

a) 4, 0, 0 and 1

b) 4, 3, 2 and 1

c) 5, 0, 0 and 1

d) 4, 0, 1 and 1

Answer: 4, 0, 0 and 1

Question: What is the IUPAC name of t-butyl alcohol.

a) 2–Methyl-propan–2-ol

b) Propanol-2

c) Butanol–2

d) Butanol–1

Answer: 2–Methyl-propan–2-ol

Question: The IUPAC name of CH₃COCH (CH₃)₂ is -

a) 3-methyl-2-butanone

b) 4-methylisopropyl ketone

c) 2-methyl-3-butanone

d) isopropyl methyl ketone

Answer: 3-methyl-2-butanone

Question: Which of the following statements is false for isopentane–

a) It has a carbon which is not bonded to hydrogen

b) It has one CH group

c) It has three CH₃ groups

d) It has one CH₂ group

Answer: It has a carbon which is not bonded to hydrogen

Question: The IUPAC name of neopentane is

a) 2, 2-dimethylpropane

b) 2, 2-dimethylbutane

c) 2-methylpropane

d) 2-methylbutane

Answer: 2, 2-dimethylpropane