Which one of the following is the correct sequence in increasing order of molecular weights of the hydrocarbons?
A
Methane, ethane, propane and butane
B
Propane, butane, ethane and methane
C
Butane, ethane, propane and methane
D
Butane, propane, ethane and methane
Correct Answer: Option A
Explanation
1. The question asks for the correct sequence of hydrocarbons in increasing order of molecular weights.
2. The given hydrocarbons are alkanes: Methane (CH4), Ethane (C2H6), Propane (C3H8), and Butane (C4H10).
3. Molecular weight increases with the number of carbon and hydrogen atoms.
4. Calculating approximate molecular weights (C=12, H=1):
- Methane: 12 + 4*1 = 16
- Ethane: 2*12 + 6*1 = 30
- Propane: 3*12 + 8*1 = 44
- Butane: 4*12 + 10*1 = 58
5. The increasing order is Methane, Ethane, Propane, Butane.