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Organic Chemistry

243 MCQ questions with answers and explanations · page 2 of 10

Test yourself▶ 25 question test▶ 50 question test

Q26. Which of the following two organic compounds have the same empirical formula?

  1. Aethylene and acetylene
  2. Bmethane and ethane
  3. Cpropane and butane
  4. Dacetylene and benzene
Show answer & explanation

Answer: A) ethylene and acetylene

Q27. Benzene and acetylene ____

  1. AMolecular formula and empirical formula are the same.
  2. BDifferent molecular formulas but same empirical formula
  3. CThe molecular formula is the same but the empirical formula is different.
  4. DNone of the above is correct.
Show answer & explanation

Answer: D) None of the above is correct.

Q28. The empirical formula of a compound is CHO and its molecular weight is 60. The molecular formula of this compound will be ____

  1. AC²H⁴O
  2. BC²H⁴ O²
  3. CCH²⁰
  4. DCH⁴O²
Show answer & explanation

Answer: B) C²H⁴ O²

Q29. The change of a solid substance directly into vapor state without changing into liquid is called_

  1. Adistillation
  2. Bboiling
  3. Csublimation
  4. Dcompaction
Show answer & explanation

Answer: B) boiling

Q30. The process by which organic compounds are slowly decomposed by microorganisms is called-

  1. Achlorination
  2. Bpolymerization
  3. Cpasteurization
  4. DFermentation
Show answer & explanation

Answer: C) pasteurization

Q31. The process by which organic compounds are slowly decomposed by microorganisms is called-

  1. Apolymerization
  2. Bcompaction
  3. Cdestruction
  4. DFermentation
Show answer & explanation

Answer: D) Fermentation

Q32. The process of formation of vapor from solid camphor is called_

  1. Aevaporation
  2. Bfreezing
  3. Cmelt
  4. Dsublimation
Show answer & explanation

Answer: C) melt

Q33. Souring of milk into curd is an example of-

  1. Asaponification
  2. BPooyan
  3. CFermentation
  4. DEsterification
Show answer & explanation

Answer: D) Esterification

Q34. An example of fermentation is_

  1. Asouring of milk
  2. Bsourdough of wet dough
  3. Cmaking alcohol from sugarcane juice
  4. DAll of the above
Show answer & explanation

Answer: C) making alcohol from sugarcane juice

Q35. The false statement regarding polymerisation is_

  1. AThis is a reversible reaction
  2. BIt consists of different types of molecules combining with each other.
  3. CThe molecular weight of a polymer compound is an integer multiple of the molecular weight of the starting compound.
  4. DIn this the carbon atoms do not form new bonds.
Show answer & explanation

Answer: D) In this the carbon atoms do not form new bonds.

Q36. An example of polymerisation is_

  1. Aconversion of acetylene to benzene
  2. BConversion of formaldehyde to trioxane
  3. Cconversion of acetaldehyde to formaldehyde
  4. DAll of the above
Show answer & explanation

Answer: B) Conversion of formaldehyde to trioxane

Q37. What type of reaction is the formation of polyethylene from ethylene?

  1. Acompaction
  2. Bpolymerization
  3. Cevaporation
  4. Ddetonation
Show answer & explanation

Answer: D) detonation

Q38. It is obtained by destructive distillation of wood_

  1. Aacetic acid
  2. Bsulfuric acid
  3. CPyroligneous acid
  4. DFormic acid
Show answer & explanation

Answer: B) sulfuric acid

Q39. Organic compounds having the same molecular formula but different structural formulas are called ____.

  1. Aisotopes
  2. Bisobar
  3. Cisomer
  4. Dallotrope
Show answer & explanation

Answer: C) isomer

Q40. Isomeric compounds show differences in

  1. Ain the molecular formula
  2. BIn the structural formula
  3. Cin chemical properties
  4. Din all of the above
Show answer & explanation

Answer: C) in chemical properties

Q41. Isomeric compounds show differences

  1. Ain physical properties
  2. BIn chemical properties
  3. Cin the molecular formula
  4. Din all of the above
Show answer & explanation

Answer: B) In chemical properties

Q42. Which of the following shows isomerism?

  1. Amethane
  2. BEthane
  3. CPropane
  4. Dbutane
Show answer & explanation

Answer: A) methane

Q43. Normal butane and iso butane are-

  1. AOptical isomer
  2. Bchain isomer
  3. Cposition isomer
  4. Dfunctional isomer
Show answer & explanation

Answer: D) functional isomer

Q44. Methyl propane is an isomer of which of the following?

  1. An-butane
  2. Bn propane
  3. Cn hexane
  4. Dpentane
Show answer & explanation

Answer: B) n propane

Q45. By which method are the different components of petroleum separated?

  1. Aby destructive distillation method
  2. Bby simple distillation method
  3. Cby fractional distillation method
  4. Dby vacuum distillation method
Show answer & explanation

Answer: A) by destructive distillation method

Q46. When petroleum is heated, the vapor evolved in the largest quantity is ___

  1. AKerosene
  2. BSaimojin
  3. CPetroleum Year
  4. DVaseline
Show answer & explanation

Answer: C) Petroleum Year

Q47. It is known as 'Liquid Gold'.

  1. Apetroleum
  2. BPlatinum
  3. CAquaregia
  4. DPyrenees
Show answer & explanation

Answer: C) Aquaregia

Q48. It is mainly found in Petro Crops.

  1. Alipids and proteins
  2. Bhydrocarbons and carbohydrates
  3. CCarbohydrates and Protein
  4. Dhydrocarbons and lipids
Show answer & explanation

Answer: A) lipids and proteins

Q49. Petroleum products can be obtained by aqueous digestion of low molecular weight hydrocarbons present in the latex of some plants. Such plants belong to which family?

  1. ALeguminosae
  2. BLiliaceae
  3. CEuphobia
  4. DSolanaceae
Show answer & explanation

Answer: D) Solanaceae

Q50. The composition of kerosene oil is ____.

  1. AC¹C⁵
  2. BC⁵C¹¹
  3. CC¹¹C¹⁶
  4. DC¹⁶ C¹⁸
Show answer & explanation

Answer: C) C¹¹C¹⁶

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