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mikeykusuma
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Organic Chemistry

Post by mikeykusuma »

https://ibb.co/BzY8TcK
Hey guys, can you help with this organic chem problem. I have difficulty on figuring out the answer. And btw it says the correct structure for the compound is this:
https://ibb.co/HKwVkYS
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ChenBeier
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Post by ChenBeier »

It is a simple oxidation from naphthalen to phthalicacid and later to the anhydride or imide.

Check Phthalic acid anhydride

https://en.wikipedia.org/wiki/Phthalic_anhydride
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Post by mikeykusuma »

thankyou for replying! but can you explain me this picture? i have trouble understanding it and i just graduated high school last month

https://upload.wikimedia.org/wikipedia/ ... nismus.svg
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Post by ChenBeier »

It is a redox reaction. Vanadium-V-oxide will be reduced to vanadium-III-oxide. This takes places several times by adding to Napthalen and oxidising the carbon. At the end Pthalic acid anhydride is remaining.
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Post by mikeykusuma »

oh okay thanks. can you explain me this one?
https://ibb.co/zFGLsV5

the A compund is https://ibb.co/1rQVYxf
and for the C compound is https://ibb.co/zr4Y1WV
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Post by ChenBeier »

It is also redox reaction of xylene or o-Methylbenzoic acid with permanganate to phthalic acid. Manganese dioxide will be formed.
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Post by mikeykusuma »

Thankyou. and by the way can you explain me this?

What is the most appropriate method for collecting ethylene, which is prepared by the reaction of ethanol and concentrated sulfuric acid? Select from 1)~4).
1) upward delivery
2) downward delivery
3) collecting gas over water
4) distillation method

the answer is: 3)
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Post by ChenBeier »

You have liquid. Ethanol decompose to ethylene an water by treating with sulfuric. So ethylene escapes the solution.
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Post by mikeykusuma »

wow, thanks! how about this one? can you explain these to me?

Anthracene is a solid polycyclic aromatic hydrocarbon of formula C14H10, consisting of three fused benzene rings. How many isomers exist for mono-substituted anthracenes?
Answer: 3

Which of the descriptions 1) to 5) is not correct? Choose two.
1) Naphthalene is obtained by the fractional distillation of coal tar.
2) Naphthalene is not soluble in ethanol.
3) Naphthalene is an aromatic compound.
4) Naphthalene is solid and easily sublimates.
5) Naphthalene has deliquescence.
6) Naphthalene easily undergoes electrophilic aromatic substitution.

Answer: 2 and 5
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Post by ChenBeier »

Draw it by yourself on a paper. How many possibilities you have?

Second one check the behaviour of napthalen.
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