Is Thiophene aromatic or not?
139994
Is its structure a ring with double bonds?
24221
The free electrons in aniline are more available to "pump negative charge" into the aromatic system than acetanilide, where the positively charged carbon in the acetyle group draws the charge outward, lessening the activation effect.
306994
it is cumene & its a C6H5 compound
726522
The correct answer would be hydrocarbons because propane, C3H8 is an alkane, Benzene, C6H6, is an aromatic hydrocarbon or a cyclic hydrocarbon, Acetylene (I'm assuming that is what you meant be Actylene), C2H2 is an alkyne, and 2-butene,C4H8, is an alkene, but all of the compounds are hydrocarbons as they only contain carbon and hydrogen.
1070364
I think you mean para-bromophenol. Phenol is an mono-hydroxy alcohol derived from a benzene ring, and ortho and para refer to the location of the alcohol group on the benzene ring. It may be that the directing group is forcing the structure into a specific shape that would only allow one form to develop at that temperature.
447194
I would imagine you are interested in phthalic acid -- if you spell it correctly (not obvious, so don't worry about that) it should be trivial to find a stucture on the www.\n\nIt is benzene-1,2-dicarboxylic acid and a bunch of other names (2-carboxy benzoic acid being another).  It is used as pthalic anhydride (take away a water) to make the plastic that they use for soft drink bottles...
1300
Naphthalene or paradichlorobenzene?  Either way, yes.
116145
If I remember my chemistry correctly, an organic molecule is one containing carbon and at least one other element.  So, a non-organic substance would be anything else.
1146377
Naphthalene is a double benzene ring and vinegar is a carboxylic acid.  As far as I know, under normal circumstances all you'll get is a wet mothball.  Probably not even that, because naphtalene doesn't dissolve in water (the primary component of household vinegar).
737699
Is the O-O-O supposed to be an epoxide ring or something?\n\nAnyway, I'm pretty sure the answer to your question is resonance, just like 80% of all organic chem questions.  The double bond and aromatic ring in the first compound help to stabilize an intermediate radical or positive charge on the carbon attached to the Oxygen chain.  The methyl groups in the second compound don't do much to stabilize an intermediate.
851509
There are two possibilities. Follow this link for a picture of the first possibility. http://img175.imageshack.us/img175/8223/ncssh2.jpg\n\nBasically, all 3 of these elements follow the octet rule (they want 8 electrons in their outermost shell), and as you can see, they all have 8. Now, S is carrying the - sign because it's formal charge is -1. Formal charge is calculated by Formal Charge=# of electrons the element has (S brings in 6) - the # of electrons it "owns" within the bond. Sulfur "owns" 7 in this case (3 lone pairs and one in a shared covalent bond--thus (3*2)+1=7.\n\nTherefore Formal Charge of Sulfur (in this case): is -1 because\n\n6-7=-1\n\nI probably made it sound more confusing than it is. Sorry about that.\n\nBut other than that, you know that Carbon should be the central atom here because it's coming in with only 4 electrons in it's valence shell, so it's more needy than Nitrogen with it's 5 and Sulfur with it's 6. So you stick it in the middle and then pretty much trial and error. \n\nThe other possibility is here.\nhttp://img175.imageshack.us/img175/6659/ncs2wf4.jpg\n\nThis time Nitrogen is carrying the -1 formal charge, because it comes into the bond with 5 electrons in it's valence shell, but it "owns" 6 in this case (2 lone pairs and 2 electrons out of the 4 in the N=C double bond..(2*2)+2=6. So...Formal charge of -1 comes from \n\n-1=5-6\n\nEven though these two molecules look different, they are in fact the same. This is a concept called resonance. \n\nI hope this wasn't too confusing.
11744
I think the question is incomplete.\nIf the question is what is the common feature of their structure, the answer is their similarity in -R group. Ornithine and lysine only differ by a single methylene(-CH2) group. Cystine has less -CH2 group where the N is replaced by less electronegative S atom. Argenine also has similar polar positively charged R group in physiological pH like ornithine and lysine.\nNone has benzene ring!!!!
414105
I presume you asking for the N15 shift since there is no proton or carbon.  There is variability of the shift depending on it's environment (is it aliphatic or aromatic?)
670708
A benzene ring, by definition, is already aromatic.  In fact, a benzene ring is the basic aromatic hydrocarbon.
443305
The simplest aromatic amine is called aniline. This compound is benzene (aromatic -C6H5) with an amine (-NH2). Unsulfonated means no -SO3H are on the benzene ring. I don't know about the toxicity of this compound without more specifics such as source of the color or structure of the impurity. Good luck.
907486
Aniline\n\nAn aromatic amine contains an amine group (-NH2-) attached to an aromatic hydrocarbon.  \nAniline should be the simplest since it contains an amine group attached to the simplest aromatic hydrocarbon.
809812
1.aliphatic(straight chain)\n2.aromatic(contains benzene ring)\n3.alicyclic(closed chain)