Criegee Intermediate Formation in Atmospheric Reactions
The formation of Criegee intermediates is a significant process in atmospheric chemistry.
Reaction Mechanism
Criegee intermediates are primarily formed through the gas-phase reaction between ozone ($O_3$) and alkenes (also known as olefins). This reaction involves the electrophilic addition of ozone to the carbon-carbon double bond of the alkene, leading to the formation of a cyclic ozonide intermediate which then decomposes.
The general reaction is:
Alkene + $O_3$ $\rightarrow$ Criegee Intermediate + other products
Analysis of Options
- Option 1: Olefin and Ozone - This aligns with the known mechanism for Criegee intermediate formation.
- Option 2: Ethane and Ozone - Ethane is a saturated hydrocarbon and does not readily react with ozone to form Criegee intermediates.
- Option 3: Acetaldehyde and Ozone - While acetaldehyde can react in the atmosphere, it's not the primary pathway for generating Criegee intermediates.
- Option 4: $NO_{2}$ and Ozone - The reaction between $NO_2$ and $O_3$ produces $NO_3$ and $O_2$, not Criegee intermediates.
Therefore, the reaction between olefins and ozone is where Criegee intermediates are formed.
Conclusion
The correct atmospheric reaction leading to the formation of Criegee intermediates involves olefins and ozone.
Important Questions from Environmental Chemistry - Teaching
Which of the following chemicals is used to cause artificial rain (cloud seeding)?
Which of the following is a non-renewable source of energy?
- Consider the following statements about solubility of gases in surface water.
A. Equilibrium concentration of a dissolved gas in water as per Henry's law is referred to as its saturation value
B. There may be more dissolved gas in water than its saturation value in water
C. It is more common for a dissolved gas to be present in less amount in water than its saturation value in water
D. The excess or deficit of a dissolved gas compared to its saturation value cannot be brought back to saturation level in water
E. Solubility of gas depends on partial pressure of the gas but is independent of purity of water
Choose the correct answer from the options given below: - Which is not a preferable characteristics of water to be used as green solvent ?
- Which of the following reaction involves the principle of green chemistry ?
