Several Questions from the 2012 GCE AL Sri Lanka

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The discussion revolves around several chemistry questions from the 2012 GCE AL Sri Lanka exam. Participants identify the organic compound as 1-hydroxy-2-methylpent-4-yn-3-one and confirm the oxidation state of sulfur in NSF as +4. The reaction of HC≡C-CH2CH2CH2NH2 with NaHCO3 is debated, with some questioning the release of CO2 from alkynes. The reaction of the compound in Picture 2 with LiAlH4 is acknowledged to produce methanol and a specific amine derivative. Lastly, the correct ascending order of the acids is established as benzoic acid, p-nitro benzoic acid, and m-nitro benzoic acid.
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Homework Statement


1. Name the Organic compound (Picture 1)
2. In the compound NSF what is the oxidation value of Sulfur?
3. What happens when HC\equivC-CH2CH2CH2NH2 + NaHCO3?
4. What are the compounds that will form by reacting the compound shown in the picture 2 with LiAlH4?
5. What is the ascending order of these acids.
Benzoic acid, m-nitro Benzoic acid, p-nitro Benzoic acid

2. The attempt at a solution
1. 1-hydroxy-2-methylpent-4-yn-3-one
2. +4
3. Releases CO2
4. Methanol + CH2NH2-(Phenol) * (OH- at the meta place relative to the methyl amine.
5 . Benzoic acid, p-nitro Benzoic acid, m-nitro Benzoic acid
 

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1. Correct
2. Correct
3. I don't think so. Alkynes are not that of strong acids to release CO2 from NaHCO3
4. Correct
5. Benzoic Acid, m-nitro Benzoic Acid, p-nitro Benzoic Acid.
 
WOO! Thanks bud. So I got all the 1,2,3,4 correct but 5th one wrong :( Anyway that's great! Thanks again!
 
You mentioned 3rd one incorrect. Did you corrected yourself afterwards?
 
Yeah. I was wondering if it releases CO2 then I thought it won't! 1 point for me!
 

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