JEE Main - Tetravalency of carbon hybridization and shapes of simple molecules Online Test (MCQ Quiz)

1. What is the characteristic valency of a carbon atom in organic compounds?

A) Two B) Three C) Four D) One

2. Which type of hybridization is adopted by carbon when it forms four single bonds?

A) sp B) sp² C) sp³ D) d²sp³

3. The hybridization of carbon in methane (CH₄) is:

A) sp B) sp² C) sp³ D) unhybridized

4. A molecule with sp³ hybridized carbon atoms will have a geometry that is:

A) Linear B) Trigonal planar C) Tetrahedral D) Square planar

5. In ethene (C₂H₄), each carbon atom is hybridized as:

A) sp B) sp² C) sp³ D) dsp²

6. The shape of a molecule with sp² hybridized carbon atoms is typically:

A) Linear B) Trigonal planar C) Tetrahedral D) Octahedral

7. In ethyne (C₂H₂), each carbon atom is hybridized as:

A) sp B) sp² C) sp³ D) sp⁴

8. A molecule with sp hybridized carbon atoms will have a geometry that is:

A) Linear B) Trigonal planar C) Tetrahedral D) Bent

9. The bond angle in methane (CH₄), where carbon is sp³ hybridized, is approximately:

A) 90° B) 109.5° C) 120° D) 180°

10. The bond angle in ethene (C₂H₄), where carbon is sp² hybridized, is approximately:

A) 90° B) 109.5° C) 120° D) 180°

11. The bond angle in ethyne (C₂H₂), where carbon is sp hybridized, is approximately:

A) 90° B) 109.5° C) 120° D) 180°

12. Which of the following carbon atoms undergoes sp³ hybridization?

A) Carbon in C₂H₂ B) Carbon in C₂H₄ C) Carbon in CH₄ D) Carbon in CO₂

13. Which of the following carbon atoms undergoes sp² hybridization?

A) Carbon in CH₄ B) Carbon in C₂H₆ C) Carbon in C₂H₄ D) Carbon in C₂H₂

14. Which of the following carbon atoms undergoes sp hybridization?

A) Carbon in CH₄ B) Carbon in C₂H₄ C) Carbon in CH₃Cl D) Carbon in C₂H₂

15. The presence of a double bond in a molecule indicates that the carbon atoms involved are hybridized as:

A) sp B) sp² C) sp³ D) unhybridized

16. The presence of a triple bond in a molecule indicates that the carbon atoms involved are hybridized as:

A) sp B) sp² C) sp³ D) unhybridized

17. In benzene (C₆H₆), each carbon atom is hybridized as:

A) sp B) sp² C) sp³ D) dsp²

18. The shape of the carbon dioxide (CO₂) molecule is:

A) Bent B) Trigonal planar C) Linear D) Tetrahedral

19. In CO₂, the carbon atom is hybridized as:

A) sp B) sp² C) sp³ D) unhybridized

20. The hybridization of the carbon atom in a carbonyl group (C=O) is:

A) sp B) sp² C) sp³ D) unhybridized

21. Which type of bond is formed by the overlap of one s orbital and one p orbital?

A) sp hybridization B) sp² hybridization C) sp³ hybridization D) Sigma bond

22. Which type of bond is formed by the overlap of one s orbital and two p orbitals?

A) sp hybridization B) sp² hybridization C) sp³ hybridization D) Pi bond

23. Which type of bond is formed by the overlap of one s orbital and three p orbitals?

A) sp hybridization B) sp² hybridization C) sp³ hybridization D) Sigma bond

24. When a carbon atom forms a single bond, a double bond, and a single bond, its hybridization is:

A) sp B) sp² C) sp³ D) unhybridized

25. When a carbon atom forms two double bonds, its hybridization is:

A) sp B) sp² C) sp³ D) unhybridized

26. The shape of a molecule where a carbon atom is bonded to three other atoms and has no lone pairs is:

A) Linear B) Trigonal planar C) Tetrahedral D) Pyramidal

27. The shape of a molecule where a carbon atom is bonded to two other atoms and has no lone pairs is:

A) Linear B) Trigonal planar C) Tetrahedral D) Bent

28. The hybridization of carbon in a carbocation (e.g., CH₃⁺) is typically:

A) sp B) sp² C) sp³ D) unhybridized

29. The shape of a carbocation (e.g., CH₃⁺) is:

A) Linear B) Trigonal planar C) Tetrahedral D) Pyramidal

30. The hybridization of carbon in a carbanion (e.g., CH₃⁻) is typically:

A) sp B) sp² C) sp³ D) unhybridized

31. The shape of a carbanion (e.g., CH₃⁻) is:

A) Linear B) Trigonal planar C) Tetrahedral D) Pyramidal

32. Which of the following is a consequence of carbon's tetravalency?

A) Formation of only ionic bonds B) Formation of chains and rings C) Inability to form multiple bonds D) Limited to forming only two bonds

33. What is the role of hybridization in explaining the shapes of molecules?

A) It determines the number of lone pairs B) It describes the mixing of atomic orbitals to form new hybrid orbitals with specific spatial orientations C) It dictates the polarity of the molecule D) It explains the reactivity of the molecule

34. In graphite, carbon atoms are hybridized as:

A) sp B) sp² C) sp³ D) unhybridized

35. In diamond, carbon atoms are hybridized as:

A) sp B) sp² C) sp³ D) unhybridized

36. The C-C single bond length in ethane (C₂H₆) is approximately:

A) 120 pm B) 134 pm C) 154 pm D) 180 pm

37. The C=C double bond length in ethene (C₂H₄) is approximately:

A) 120 pm B) 134 pm C) 154 pm D) 180 pm

38. The C≡C triple bond length in ethyne (C₂H₂) is approximately:

A) 120 pm B) 134 pm C) 154 pm D) 120 pm

39. The hybridization of carbon in a free radical (e.g., CH₃•) is generally considered to be:

A) sp B) sp² C) sp³ D) unhybridized

40. The shape of a carbon free radical (e.g., CH₃•) is typically:

A) Linear B) Trigonal planar C) Tetrahedral D) Pyramidal

41. What is the approximate percentage of s-character in sp³ hybridization?

A) 33.3% B) 25% C) 50% D) 75%

42. What is the approximate percentage of s-character in sp² hybridization?

A) 33.3% B) 25% C) 50% D) 75%

43. What is the approximate percentage of s-character in sp hybridization?

A) 33.3% B) 25% C) 50% D) 75%

44. Which type of overlap leads to the formation of sigma bonds?

A) Sideways overlap of p orbitals B) Head-on overlap of atomic orbitals C) Overlap of hybrid orbitals D) Both B and C

45. Which type of overlap leads to the formation of pi bonds?

A) Head-on overlap of atomic orbitals B) Sideways overlap of p orbitals C) Overlap of hybrid orbitals D) Overlap of s orbitals only

46. In a carbon atom forming a double bond, how many pi bonds are present?

A) Zero B) One C) Two D) Three

47. In a carbon atom forming a triple bond, how many pi bonds are present?

A) Zero B) One C) Two D) Three

48. The concept of hybridization helps explain:

A) The atomic number of elements B) The magnetic properties of elements C) The observed bond angles and molecular shapes D) The ionization energies of elements

49. Which of the following molecules has a central carbon atom that is sp³ hybridized and exhibits a tetrahedral geometry?

A) Ethyne (C₂H₂) B) Ethene (C₂H₄) C) Methane (CH₄) D) Carbon dioxide (CO₂)

50. Which of the following molecules has a central carbon atom that is sp² hybridized and exhibits a trigonal planar geometry?

A) Ethyne (C₂H₂) B) Ethene (C₂H₄) C) Methane (CH₄) D) Ammonia (NH₃)

Tetravalency of carbon hybridization and shapes of simple molecules - Online Test

Test Results