24. M/J 2016/P11/Q39
How many moles of hydrogen chloride are formed when one mole of methane reacts with a large excess of chlorine in sunlight?
A 1
B 2
C 3
D 4
Answer: D
Explaination
This is about substitution reaction of alkane in which chlorine molecule replace H atom from alkane molecule and occupied that space.
Here are the steps of substitution reaction of alkane,
CH4 + Cl2 ------------------> CH3Cl + HCl ( 1 mole of HCl )
CH3Cl + Cl2 -------------------> CH2Cl2 + HCl ( 1 mole of HCl )
CH2Cl2 + Cl2 -------------------> CHCl3 + HCl ( 1 mole of HCl )
CHCl3 + Cl2 -------------------> CCl4 + HCl ( 1 mole of HCl )
The final summarized equation will be
CH4 + 4Cl2 --------------------------------------> CCl4 + 4HCl
So, total 4 moles of HCl are formed.
