Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: Volatile Organic compounds (VOCs) often are measured in the atmosphere as non-methane hydrocarbons.
Reason R : Methane is highly reactive in photochemical smog formation.
In the light of the above statements, choose the correct answer from the options given below:
A is true but R is false.
To determine the correct answer, we need to analyze both the Assertion A and Reason R.
Assertion A: "Volatile Organic Compounds (VOCs) often are measured in the atmosphere as non-methane hydrocarbons."
This statement is true. VOCs, which play a significant role in atmospheric chemistry, particularly in the formation of ozone and photochemical smog, are typically measured in terms of non-methane hydrocarbons (NMHCs). This is because methane (\text{CH}_4) is generally considered a separate category due to its abundance and distinct chemical properties, which influence different atmospheric processes compared to other VOCs.
Reason R: "Methane is highly reactive in photochemical smog formation."
This statement is false. Methane is relatively less reactive compared to many other VOCs when it comes to participating in reactions that lead to photochemical smog formation. Methane has a long atmospheric lifetime and does not contribute significantly to the reactive processes that form smog in urban areas. Instead, other non-methane VOCs are more reactive and impactful in forming smog.
Given the analysis:
- Assertion A is true as it correctly states that VOCs are often measured as non-methane hydrocarbons.
- Reason R is false because methane is not as reactive in forming photochemical smog compared to other VOCs.
Thus, the correct answer is: A is true but R is false.
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