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Chapter 5: Problem 146

Which one of the following species is not a pseudohalide? (a) CNO- (b) \(\mathrm{RCOO}^{-}\) (c) \(\mathrm{OCN}^{-}\) (d) NNN'

Short Answer

Expert verified
(b) RCOO鈦� is not a pseudohalide.

Step by step solution

01

Define Pseudohalides

Pseudohalides are polyatomic anions that mimic the behavior of halide ions (Cl鈦�, Br鈦�, etc.). Common examples include ions like cyanide (CN鈦�), thiocyanate (SCN鈦�), and azide (N鈧冣伝), which share similar chemical properties with halide ions.
02

Identify the Given Species

The given species are: (a) CNO鈦� (cyanate ion), (b) RCOO鈦� (carboxylate ion, where R is an organic group), (c) OCN鈦� (isocyanate ion), and (d) NNN鈦� (azide ion).
03

Determine Which are Pseudohalides

Among the given ions, CNO鈦� can behave like a pseudohalide (similar to OCN鈦�), and NNN鈦� (azide ion) is a known pseudohalide. However, RCOO鈦� (carboxylate ion) is not classified as a pseudohalide because it lacks the structural characteristics and ionic behavior typical of pseudohalides.
04

Conclusion

Based on the analysis, species (b) RCOO鈦� is the only ion that does not fit the definition or behavior of a pseudohalide. Hence, it is the odd one out among the given options.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Polyatomic Anions
Polyatomic anions are ions that consist of two or more atoms bonded together, with an overall negative charge. These ions are quite common in chemistry and are often composed of elements like nitrogen, oxygen, and carbon.
  • An example of a polyatomic anion is the cyanate ion, \(CNO^-\), which consists of carbon, nitrogen, and oxygen atoms.
  • Another example is the azide ion, \(N_3^-\), composed entirely of nitrogen atoms.
Polyatomic anions often appear in various chemical reactions, where they may combine with cations (positively charged ions) to form salts. Their structure and composition allow them to participate in a wide range of chemical processes. These anions are critical to understanding different types of chemical bonds and reactions, particularly in inorganic chemistry.
Halide Ions
Halide ions are a type of single-atom anion derived from halogens, such as chlorine, bromine, and iodine. These ions are typically represented as \(Cl^-\), \(Br^-\), or \(I^-\) and are known for their simplicity and straightforward chemical behavior.
  • They are formed when a halogen atom gains an extra electron, acquiring a negative charge.
  • Due to their negative charge, halide ions are commonly found in ionic compounds and play a key role in various chemical processes, such as precipitation reactions and substitution reactions.
Halide ions are often used as a benchmark for comparing the chemical behavior of other anions, such as pseudohalides. Despite their simplicity, halide ions are integral to many reactions and processes, making them an essential part of the study of chemistry.
Chemical Properties
Chemical properties refer to the characteristics of a substance that determine how it reacts with other chemicals. These properties can be observed when substances change or react to form new substances.
  • For pseudohalides, chemical properties involve their ability to mimic the behavior of halide ions in chemical reactions.
  • Because pseudohalides can often form similar compounds and partake in similar reactions as halide ions, they are useful for studying the reactivity and properties of halides themselves.
Chemical properties are crucial for understanding how a substance interacts with its environment, whether it鈥檚 combining with another element to form a compound or breaking down into simpler substances. By observing these properties, scientists can predict how substances will behave in different chemical contexts, essential for research and practical applications.

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Most popular questions from this chapter

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