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

 

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