what are the necessary conditions for any compound to show aromaticity?
317665
['(i) It should have a planar structure.', '(ii) The π–electrons of the compound are completely delocalized in the ring.', '(iii) The total number of π–electrons present in the ring should be equal to (4n + 2), where n = 0, 1, 2 … etc.']
1270055
Aromatics are produced by catalytic reforming of naphtha. Olefins and aromatics are the building-blocks for a wide range of materials such as solvents, detergents, and adhesives. Olefins are the basis for polymers and oligomers used in plastics, resins, fibers, elastomers, lubricants, and gels.
169001
['ammonia,', 'peroxide,', 'p-phenylenediamine,', 'diaminobenzene,', 'toluene-2,5-diamine,', 'resorcinol etc.']
380043
The aromatic compound which has only benzene rings in their structure is known as a benzenoid aromatic compound. Example: Naphthalene, Aniline, etc.
749602
['Can be isolated as well as prepared in laboratory.', 'Comprise almost 90% of all known compounds.', 'Mostly built up of only three elements- carbon, hydrogen and oxygen. ... ', 'Possess complex structures and high molecular weights.']
173330
Pyrrole is weakly basic, with a conjugate acid pKa of −3.8. The most thermodynamically stable pyrrolium cation (C4H6N+) is formed by protonation at the 2 position. Substitution of pyrrole with alkyl substituents provides a more basic molecule—for example, tetramethylpyrrole has a conjugate acid pKa of +3.7.
336813
A knowledge of the ionization constants (pKa) of compounds is important for much of the work carried out in the drug discovery process. ... Notably, compounds in their unionized form tend to be less soluble but can more easily penetrate lipophilic barriers existing between them and a biological target of interest.
399371
['They have same functional group.', 'they have same general formula of representation.', 'they have same general method of preparation.', 'They have same chemical properties.', 'Adjacent members are differ from each other by CH2 unit.']
905512
Pyrrole is a much weaker base than pyridine (see above). This is because the lone pair on the N atom is already involved in the aromatic array of p electrons. Protonation results in loss of aromaticity and is therefore unfavourable.
1128252
['they possess different physical properties.', 'they have different chemical property.', 'they show similar properties when they contain same functional group.', 'They have same molecular formula but different structural formula.', '2 isomers have different Boiling point.', 'They have same atomic weight and same number of atoms.']
1193822
In aromatic amines the -NH2 Group is attached to PHENYL Group (-C6H5 ) is which is electron attracting. So the availability of the lone pair of electron on the Nitrogen atom will be less and hence will be less basic than Aliphatic amines.
95516
1 Answer. They don't have values there because they aren't on the pauling scale of electronegativity, as they don't form any compounds with other elements. ... The other noble gases also can react with fluorine (As well as other elements), and make slightly more stable compounds.
868664
['Ingredient.', 'ETHYLBENZENE. ... ', 'PETROLEUM GASES, LIQUEFIED, SWEETENED. ... ', 'BUTOXYDIGLYCOL. ... ', 'KEROSENE (PETROLEUM), HYDROTREATED. ... ', 'ACETONE. ... ', 'XYLENE. ... ', 'PROPANE.']
841732
['Proximity and orientation. ... ', 'Proton donors or acceptors. ... ', 'Electrostatic catalysis. ... ', 'Covalent catalysis. ... ', 'Metal ion catalysis. ... ', 'Bond strain. ... ', 'Quantum tunneling. ... ', 'Active enzyme.']
160089
['Reactivity with other chemicals.', 'Toxicity.', 'Coordination number.', 'Flammability.', 'Enthalpy of formation.', 'Heat of combustion.', 'Oxidation states.', 'Chemical stability.']
535252
['Identify the cation.', 'Write the correct formula and charge for the cation.', 'Identify the anion.', 'Write the correct formula and charge for the anion.', 'Combine the cation and anion to produce an electrically neutral compound.']
610889
But one of the alkene which would not be decolourised by bromine water is benzene . As aromatic compounds are highly stable and tend to be stable .