2
Question
Which is the most suitable reagent among the following to distinguish compound (iii) from rest of the compounds?
(i) CH3−C≡C−CH3
(ii) CH3−CH2−CH2−CH3
(iii) CH3−CH2−C≡CH
(iv) CH3−CH=CH2
Which is the most suitable reagent among the following to distinguish compound (iii) from rest of the compounds?
(i) CH3−C≡C−CH3
(ii) CH3−CH2−CH2−CH3
(iii) CH3−CH2−C≡CH
(iv) CH3−CH=CH2
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Solution
The correct option is D Ammonical silver nitrate
Only terminal alkynes (but-1-yne) react with ammoniacal solution of silver nitrate (AgNO3).
(iii) CH3−CH2−C≡CH+2[Ag(NH3)2]NO3→CH3−CH2−C≡C−Ag+ white ppt
Rest other compounds donot react with ammoniacal solution of silver nitrate (AgNO3).
(i) CH3−C≡C−CH3+2[Ag(NH3)2]NO3→No reaction
(ii) CH3−CH2−CH2−CH3+2[Ag(NH3)2]NO3→No reaction
(iv) CH3−CH=CH2+2[Ag(NH3)2]NO3→No reaction
Hence correct option is d.
Only terminal alkynes (but-1-yne) react with ammoniacal solution of silver nitrate (AgNO3).
(iii) CH3−CH2−C≡CH+2[Ag(NH3)2]NO3→CH3−CH2−C≡C−Ag+ white ppt
Rest other compounds donot react with ammoniacal solution of silver nitrate (AgNO3).
(i) CH3−C≡C−CH3+2[Ag(NH3)2]NO3→No reaction
(ii) CH3−CH2−CH2−CH3+2[Ag(NH3)2]NO3→No reaction
(iv) CH3−CH=CH2+2[Ag(NH3)2]NO3→No reaction
Hence correct option is d.
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