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Heteroarenes are aromatic compounds, where at least one methine or vinylene (-C= or -CH=CH-) group is replaced by a heteroatom: oxygen, nitrogen, or sulfur. [3] Examples of non-benzene compounds with aromatic properties are furan, a heterocyclic compound with a five-membered ring that includes a single oxygen atom, and pyridine, a heterocyclic compound with a six-membered ring containing one ...
The SLC (Class 11 and 12) and SEE (Class 10) examinations are normally scheduled from April to June each year. The examinations are conducted by the National Examination Board (NEB), located in Sanothimi, Bhaktapur, Nepal. Until 2016, SLC was the Grade 10 final examination, famously known as the "iron gate" [citation needed]. However, after ...
In organic chemistry, Möbius aromaticity is a special type of aromaticity believed to exist in a number of organic molecules. [ 1 ] [ 2 ] In terms of molecular orbital theory these compounds have in common a monocyclic array of molecular orbitals in which there is an odd number of out-of-phase overlaps, the opposite pattern compared to the ...
The SEE examination is said to be scheduled in March of every year. As the new Education Act, 2016 (2073) has been implemented, the SLC examination will be taken place in Grade 12 as a national level examination whereas the examination of Grade 10 will be known as Secondary Education Examination (S.E.E).
Some such structures may contain aromatic π-sextets, namely groups of six π-electrons localized in a benzene-like moiety and separated by adjacent rings through C–C bonds. An aromatic π-sextet can be represented by a circle, as in the case of the anthracene molecule (below). Clar's rule states that for a benzenoid polycyclic aromatic ...
National Examination Board is responsible for conducting and managing 12th grade-Higher Secondary exams and 10th grade Secondary Education Examination (SEE) Exams. [3] The jurisdiction of the previous Higher Secondary Education Board (HSEB) was limited to 11th and 12th-grade high school (10+2) only. HSEB was established in 1989 under the Higher ...
Simple aromatic rings can be heterocyclic if they contain non-carbon ring atoms, for example, oxygen, nitrogen, or sulfur. They can be monocyclic as in benzene, bicyclic as in naphthalene, or polycyclic as in anthracene. Simple monocyclic aromatic rings are usually five-membered rings like pyrrole or six-membered rings like pyridine.
In organic chemistry, the aromatic alcohols or aryl-alcohols are a class of chemical compounds containing a hydroxyl group (−O H) bonded indirectly to an aromatic hydrocarbon group, [1] in contrast to the phenols, where the hydroxyl group is bonded directly to an aromatic carbon atom. [2] Aromatic alcohols are produced by the yeast Candida ...