Hydrocarbons Question 278
Question: An unknown compound A has a molecular formula $ C_2H_6 $ , when A is treated with an excess of $ Br_2 $ , a new substance B with formula $ C_4H_6Br_2 $ is formed. A forms a white precipitate with ammonical silver nitrate solution. A may be
Options:
A) Butyne-1
B) Butyne-2
C) Butene-1
D) Butene-2
Show Answer
Answer:
Correct Answer: A
Solution:
[a] Conversion of $ C_4H_6 $ to $ C_4H_6Br_2 $ indicates that the compound is either butyne-1 or butyne-2.
However, white precipitate with ammonical silver nitrate solution indicates that it is a terminal alkyne, i.e.
butyne-1 and not butyne-2
BETA
