Hydrocarbons Question 168
Question: Which one of the following characteristics apply to both ethene and ethyne [NCERT 1990]
Options:
A) Explode when mixed with chlorine
B) Decolourise Baeyer’s reagent giving brown precipitate
C) Rapidly absorbed by cold conc. $ H_2SO_4 $
D) Form white precipitate with silver nitrate solution
Show Answer
Answer:
Correct Answer: B
Solution:
$ CH_2=CH_2+\underset{alk\text{.}}{\mathop{KMnO_4}}\underset{H_2O}{\mathop{\xrightarrow{[O]}}}\underset{OH}{\mathop{\underset{|}{\mathop{CH_2}}}}\underset{Colourless}{\mathop{-\underset{OH}{\mathop{\underset{|}{\mathop{CH_2}}}}+}}\underset{\begin{matrix} Brown \\ {} \\ \end{matrix}}{\mathop{MnO_2}} $
$ CH\equiv CH+\underset{alk.}{\mathop{KMnO_4}}\xrightarrow{[O]}\underset{\text{Oxalic acid}}{\mathop{\underset{COOH}{\mathop{\underset{|}{\mathop{COOH}}}}}}+\underset{\begin{matrix} {} \\ Brown \\ \end{matrix}}{\mathop{MnO_2}} $
BETA
