Methane (CH4):

1.Is a greenhouse gas

2.Is a polycyclic aromatic hydrocarbon

3.Is a component in determining the Air Quality Index (AQI)

4.Helps in the formation of ozone

5.Is a Volatile Organic Compound (VOC)

A1, 2 & 3 only

B1, 4 & 5 only ✓ Correct

C1 & 5 only

D3, 4 & 5 only

Correct answer: (B) 1, 4 & 5 only

Explanation

Methane is a greenhouse gas, a precursor of tropospheric ozone and a volatile organic compound.

Statement 1 is correct, as methane traps heat and is a potent greenhouse gas.

Statement 2 is wrong, since methane is the simplest alkane, not a polycyclic aromatic hydrocarbon.

Statement 3 is wrong, as methane is not among the pollutants used to compute the Air Quality Index.

Statement 4 is correct, since methane helps generate ground-level ozone in sunlight.

Statement 5 is correct, as methane is a volatile organic compound.

Its warming potential far exceeds that of carbon dioxide over short timescales.

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