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JIPMER 2005

Exam: JIPMER
Year: 2005
Subject: Chemistry
Chapter: Hydrocarbons

JIPMER 2005 · Chemistry · Hydrocarbons

Butyne-1 and butyne- 2 can be distinguished by

Butyne-1 and butyne- 2 can be distinguished by

Options

A $\mathrm{H}_2 \mathrm{SO}_4$
B $\mathrm{AgNO}_3+\mathrm{NH}_4 \mathrm{OH}$
C $\mathrm{K}_2 \mathrm{Cr}_2 \mathrm{O}_7$
D $\mathrm{NH}_4 \mathrm{OH}$

Correct answer

B. $\mathrm{AgNO}_3+\mathrm{NH}_4 \mathrm{OH}$

Step-by-step solution

Butyne-1 has the terminal hydrogen atom which reacts with ammonical silver nitrate easily and liberate hydrogen.

2 \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CH}+\mathrm{Ag}_2 \mathrm{O} \longrightarrow \underset{\text{white ppt}}{\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{C} \equiv \mathrm{CAg}+\mathrm{H}_2 \mathrm{O}}

Hence butyne- 1 and butyne- 2 are distinguished by

\mathrm{AgNO}_3+\mathrm{NH}_4 \mathrm{OH}

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