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Question

Which is the most suitable reagent among the following to distinguish compound (iii) from rest of the compounds?
(i) CH3CCCH3
(ii) CH3CH2CH2CH3
(iii) CH3CH2CCH
(iv) CH3CH=CH2 


A
Bromine in carbon tetrachloride
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B
Bromine in acetic acid
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C
Alkaline KMnO4
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D
Ammonical silver nitrate 
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Solution

The correct option is A Ammonical silver nitrate 
Only terminal alkynes (but-1-yne) react with ammoniacal solution of silver nitrate (AgNO3).
(iii) CH3CH2CCH+2[Ag(NH3)2]NO3CH3CH2CCAg+                                                                                         white ppt
Rest other compounds donot react with ammoniacal solution of silver nitrate (AgNO3).
(i) CH3CCCH3+2[Ag(NH3)2]NO3No reaction
(ii) CH3CH2CH2CH3+2[Ag(NH3)2]NO3No reaction
(iv) CH3CH=CH2+2[Ag(NH3)2]NO3No reaction
Hence correct option is d.

Chemistry

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