Question

Which of the following alkynes can be identified and distinguished from the rest of the alkynes on reaction with ammoniacal silver to gave a white precipitate?

• A. $\mathrm { CH } _ { 3 } \equiv \mathrm { C } - \mathrm { CH } _ { 3 }$
• B. $\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \equiv \mathrm { CH }$
• C. $\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \mathrm { C } \equiv \mathrm { CCH } _ { 3 }$
• D. $\mathrm { CH } _ { 3 } \mathrm { C } \equiv \mathrm { CCH } _ { 2 } \mathrm { CH } _ { 2 } \mathrm { CH } _ { 3 }$

Answer 1

Answer: (B)

$\mathrm { CH } _ { 3 } \mathrm { CH } _ { 2 } \equiv \mathrm { CH }$

Answer 2

: only terminal alkynes react with ammoniacal silver nitrate to give white precipitate of silver acetylides.