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Organic Chemistry
Posted: Sat Jun 22, 2019 12:33 am
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
Posted: Sun Jun 23, 2019 4:47 am
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
Posted: Tue Jun 25, 2019 5:08 am
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
Posted: Tue Jun 25, 2019 5:12 am
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.
Posted: Tue Jun 25, 2019 6:31 am
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
Posted: Tue Jun 25, 2019 6:39 am
by ChenBeier
It is also redox reaction of xylene or o-Methylbenzoic acid with permanganate to phthalic acid. Manganese dioxide will be formed.
Posted: Tue Jun 25, 2019 7:13 am
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)
Posted: Tue Jun 25, 2019 2:00 pm
by ChenBeier
You have liquid. Ethanol decompose to ethylene an water by treating with sulfuric. So ethylene escapes the solution.
Posted: Tue Jun 25, 2019 4:06 pm
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
Posted: Wed Jun 26, 2019 1:22 am
by ChenBeier
Draw it by yourself on a paper. How many possibilities you have?
Second one check the behaviour of napthalen.
