Hydrocarbons Ques 61
61. Which is the most suitable reagent among the following to distinguish compound (3) from rest of the compounds?
[1989]
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$\mathrm{CH}_3-\mathrm{C} \equiv \mathrm{C}-\mathrm{CH}_3$
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$\mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{CH}_3$
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$\mathrm{CH}_3-\mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH}$
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$\mathrm{CH}_3-\mathrm{CH}=\mathrm{CH}_2$.
(a) Bromine in carbon tetrachloride
(b) Bromine in acetic acid
(c) Alk. $\mathrm{KMnO}_4$
(d) Ammoniacal silver nitrate.
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Answer:
Correct Answer: 61.(d)
Solution: (d) $\mathrm{Br}_2$ in $\mathrm{CCl}_4$ (a), $\mathrm{Br}_2$ in $\mathrm{CH}_3 \mathrm{COOH}$ (b) and alk. $\mathrm{KMnO}_4$ (c) will react with all unsaturated compounds, i.e., $1,3$ and $4$ while ammoniacal $\mathrm{AgNO}_3(\mathrm{~d})$ reacts only with terminal alkynes, i.e., $3$ and hence compound $3$ can be distinguished from $1, 2$ and $4$ by. ammoniacal $\mathrm{AgNO}_3(\mathrm{~d})$.
BETA
