Which one of the following molecules contains no bond?

Q: Which one of the following molecules contains no bond?

To determine which molecule contains no bond, we need to draw the Lewis structures for each option and identify the types of bonds present. Concept: A single bond consists of one bond. A double bond consists of one bond and one bond. A triple bond consists of one bond and two bonds. Why (D) is correct: A) : The Lewis structure of involves resonance structures with one S=O double bond and one S-O single bond (or two S=O double bonds if considering expanded octet). A double bond contains one and one bond. Therefore, contains at least one bond. B) : The Lewis structure of involves resonance structures with one N=O double bond and one N-O single bond, along with an unpaired electron on nitrogen. A double bond contains one and one bond. Therefore, contains at least one bond. C) : The Lewis structure of is O=C=O. Each double bond consists of one bond and one bond. Thus, contains two bonds. D) : The Lewis structure of is H-O-H. It consists of two O-H single bonds. Each single bond is a bond. There are no double or triple bonds. Therefore, contains no bonds. Correct Answer: (D)

Question

Accepted Answer

To determine which molecule contains no $π$ bond, we need to draw the Lewis structures for each option and identify the types of bonds present.

Concept: A single bond consists of one $σ$ bond. A double bond consists of one $σ$ bond and one $π$ bond. A triple bond consists of one $σ$ bond and two $π$ bonds.

Why (D) is correct:

A) $SO_{2}$ : The Lewis structure of $SO_{2}$ involves resonance structures with one S=O double bond and one S-O single bond (or two S=O double bonds if considering expanded octet). A double bond contains one $σ$ and one $π$ bond. Therefore, $SO_{2}$ contains at least one $π$ bond.
B) $NO_{2}$ : The Lewis structure of $NO_{2}$ involves resonance structures with one N=O double bond and one N-O single bond, along with an unpaired electron on nitrogen. A double bond contains one $σ$ and one $π$ bond. Therefore, $NO_{2}$ contains at least one $π$ bond.
C) $CO_{2}$ : The Lewis structure of $CO_{2}$ is O=C=O. Each double bond consists of one $σ$ bond and one $π$ bond. Thus, $CO_{2}$ contains two $π$ bonds.
D) $H_{2} O$ : The Lewis structure of $H_{2} O$ is H-O-H. It consists of two O-H single bonds. Each single bond is a $σ$ bond. There are no double or triple bonds. Therefore, $H_{2} O$ contains no $π$ bonds.

Correct Answer: (D)

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