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

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

More Questions.....................

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