Multiple Choice
Which of the following statements correctly describes the Lewis dot structure of the neutral compound C2H3N (acetonitrile)?
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11. Bonding & Molecular Structure
Lewis Dot Structures: Neutral Compounds
Multiple Choice
Which of the following statements correctly describes the Lewis dot structure for the neutral compound Sr(CN)2?
A
Sr donates two electrons to form Sr2+, and each CN group is present as a linear anion with a triple bond between C and N.
B
Sr forms single bonds with the carbon atoms of each CN group, and the CN groups have double bonds between C and N.
C
Sr remains neutral, and each CN group is present as a neutral molecule with a single bond between C and N.
D
Sr shares electrons covalently with both CN groups, resulting in a bent geometry for each CN.
Verified step by step guidance1
Identify the nature of the elements involved: Sr is an alkaline earth metal, which typically forms cations by losing electrons, while CN is a polyatomic ion known as cyanide.
Determine the likely charge on Sr in the compound Sr(CN)2. Since Sr is in group 2, it tends to lose two electrons to form Sr^{2+}.
Recognize that each CN group acts as a cyanide ion (CN^{-}), which carries a negative charge and has a characteristic linear structure with a triple bond between carbon and nitrogen.
Understand that the bonding between Sr^{2+} and the two CN^{-} ions is ionic, not covalent, so Sr does not share electrons covalently but donates electrons to form the cation.
Conclude that the correct Lewis structure shows Sr^{2+} ion and two linear CN^{-} ions, each with a triple bond between C and N, consistent with the ionic nature and geometry of the compound.
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