Free Sigma and Pi Bonds MCQs with Answers
34 Sigma and Pi Bonds MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
A sigma bond forms by direct end-to-end overlap along the internuclear axis, whereas a pi bond forms by sideways overlap of parallel orbitals. The topic covers single, double and triple bonds, bond composition, restricted rotation and the relation between sigma and pi bonding and orbital hybridisation.
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34 questions · page 2 of 2
- A. It forms after a sigma bond
- B. It is formed by parallel overlapping of orbitals
- C. P orbital may form a pi bond
- D. Hybrid orbital forms a pi bond
Explanation: The explanation for this question will be added soon.
Correct answer: Hybrid orbital forms a pi bond22. Which of the following compounds possesses only a single covalent bond between carbon and hydrogen?
- A. CH4
- B. C2H2
- C. C2H4
- D. All of the above
Explanation: All of the above possess a single covalent bond between carbon and hydrogen. Hence, option D is right option
Correct answer: All of the above- A. Pi bond between hybridized orbitals
- B. Sigma bond between hybridized orbitals
- C. Pi bond between unhybridized orbitals
- D. Sigma bond between unhybridized orbitals
Explanation: Option A: Pi bond between hybridized orbitals: In molecular orbital theory, hybridized orbitals can overlap to form sigma bonds.
Correct answer: Pi bond between unhybridized orbitals- A. One sigma and one pi bond
- B. 2 sigma bonds
- C. 2 pi bonds
- D. Half pi and half sigma bond
Explanation: OPTION A: A double bond consists of one sigma bond and one pi bond. A sigma bond is a strong covalent bond formed by the overlap of two…
Correct answer: One sigma and one pi bond- A. 3
- B. 2
- C. 1
- D. 0
Explanation: One C=C will have "one" pi bond in it as a double covalent bond consisting of one pi bond and one sigma bond.
Correct answer: 1- A. Covalent
- B. Electrovalent
- C. Hydrogen bond
- D. Coordinate covalent bond
Explanation: Coordinate covalent bond: A coordinate covalent bond is formed when one atom donates a pair of electrons to be shared with another atom.
Correct answer: Coordinate covalent bond- A. Ionic
- B. Covalent
- C. Coordinate covalent
- D. None of the above
Explanation: Covalent bonds involve the sharing of electrons between atoms. Boron typically forms covalent bonds by sharing electrons with hydrogen.
Correct answer: Covalent- A. one sigma bond, two pi bonds
- B. one sigma bond, four pi bonds
- C. two sigma bonds, four pi bonds
- D. three sigma bonds, two pi bonds
Explanation: Hence ethyne has one sigma bond formed by carbon carbon over lapping and the other two sigma bonds are formed by carbon hydrogen…
Correct answer: three sigma bonds, two pi bonds- A. He2+
- B. H2-
- C. H2+
- D. H2-2
Explanation: MOLECULAR ORBITAL THEORY: It states that all the atoms tend to combine together and form molecular orbitals.
Correct answer: H2-2- A. sp2 - sp
- B. sp2 - sp2
- C. sp3 - sp2
- D. sp - sp
Explanation: The correct answer is sp2 - sp2. In aldehydes and ketones, the carbonyl carbon atom is sp2 hybridized.
Correct answer: sp2 - sp2- A. 6
- B. 9
- C. 11
- D. 4
Explanation: The molecule CH2=CH-CH=CH2 consists of four carbon atoms and four hydrogen atoms.
Correct answer: 9- A. CaF2
- B. MgO
- C. KCI
- D. H2
Explanation: Covalent bond is a chemical bond that involves the sharing of electrons,options A, B and C all show ionic bonds, therefore the correct…
Correct answer: H2- A. It would be disproportion
- B. It would be ratio active
- C. It violates the pauli exclusion principle
- D. No H-H bond would form
Explanation: H22+ cannot be formed as it will be a very unstable structure due to the fact that there would be no bond between H-H
Correct answer: No H-H bond would form- A. 1/2
- B. 1
- C. 2
- D. 1.5
Explanation: The bond order of H2+ is 1/2. This means that the molecule has a half-filled bonding orbital.
Correct answer: 1/2