Hydrocarbons Question 310
Question: A mixture of methane, ethylene and acetylene gases is passed through a Wolf’s bottle containing ammoniacal cuprous chloride. The gas coming out is [NCERT 1976]
Options:
A) Methane
B) Acetylene
C) A mixture of methane and ethylene
D) The original mixture
Show Answer
Answer:
Correct Answer: C
Solution:
Acetylene reacts with ammonical cuprous chloride to form red ppt.
of copper acetylide while methane and ethylene do not react (since they do not have acidic hydrogen) They come out from the bottle $ CH\equiv CH+2[Cu{{(NH_3)}_2}]OH\to $
$ Cu-C\equiv C-Cu+4NH_3+2H_2O $
$ CH_4+AmmonicalCu_2Cl_2\to Noreaction $
$ C_2H_4+AmmonicalCu_2Cl_2\to Noreaction $
BETA
