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Organic Chemistry
Bhaskar Tetarbe's Avatar
Bhaskar Tetarbe
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24 Apr 2009 12:08:18 IST
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Alkynes question
None

Q. Which of these will not react with acetylene ?

a) NaOH           b) ammonical AgNO3       c) Na         d) HCl 


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ratnesh mishra's Avatar

ratnesh mishra
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24 Apr 2009 12:13:34 IST
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its b) ammonical AgNO3
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24 Apr 2009 12:13:47 IST
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naoh....
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Rishabh Rishabh's Avatar

Rishabh Rishabh
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24 Apr 2009 12:14:07 IST
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Ans: B
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Bhaskar Tetarbe's Avatar

Bhaskar Tetarbe
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24 Apr 2009 12:15:17 IST
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@killerkiran ...HIBERNATING...

Ans given NaOH is correct acc to the solution.

But tell me how come an acidic compound like acetylene not react with NaOH ?
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24 Apr 2009 12:16:10 IST
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naoh is not strong enuf.....but na will react as it is strong...
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pranav agrawal's Avatar

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24 Apr 2009 12:16:54 IST
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ans D
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Bhaskar Tetarbe's Avatar

Bhaskar Tetarbe
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24 Apr 2009 12:17:08 IST
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How come an alkali is not stronger than its corresponding base ?
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ratnesh mishra
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24 Apr 2009 12:17:49 IST
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then why is oxalic acid formed when acetylene reacts with KMnO4 in alkaline medium
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Bhaskar Tetarbe's Avatar

Bhaskar Tetarbe
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24 Apr 2009 12:18:09 IST
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@ Pranav, even I think it shud be HCl but I dont understand how it cud be NaOH.
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Killer Kiran's Avatar

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24 Apr 2009 12:18:39 IST
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remember acetylene is a very weak acid....
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24 Apr 2009 12:19:14 IST
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acetylene contains a acidic H ... so will react with naoh not with hcl ~~ reacts with agno3 n na ~~
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ratnesh mishra
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24 Apr 2009 12:20:00 IST
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@ pranav agrawal when acetylene reacts with HCl in presence of HgCl2 first vinyl chloride is formed & again it reacts with another mole to form ethylidene chloride
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Bhaskar Tetarbe's Avatar

Bhaskar Tetarbe
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24 Apr 2009 12:20:10 IST
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@Ratnesh, KMnO4 sure will oxidise acetylene as it shud. Dont get carried away by the 'alkaline' KMnO4.
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24 Apr 2009 12:21:11 IST
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i m getting a feeling dat this is previous yr aieee qn?????
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Bhaskar Tetarbe's Avatar

Bhaskar Tetarbe
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24 Apr 2009 12:21:47 IST
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Okay, thanks Ratnesh HCl prob sorted now. But please anyone explain abt NaOH.
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Bhaskar Tetarbe's Avatar

Bhaskar Tetarbe
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24 Apr 2009 12:22:32 IST
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No killerkain this question is from a book.
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24 Apr 2009 12:24:10 IST
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but i ve seen the same qn....nd my teachr had told dat this will not react with naoh....
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24 Apr 2009 12:25:18 IST
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addition of hcl in presence of hgcl2 is a form of nucleophilic addition reaction which wont occur until hgcl2 is added, which is not mentioned here ~
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ratnesh mishra
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24 Apr 2009 12:28:01 IST
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@ pranav agrawal look up in the ncert textbook in hydrocarbons chapter class 11 somewhere around page 385 its given ther
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