Benzene is an organic chemical compound with the molecular formula C6H6. It is composed of six carbon atoms joined in a planar ring, with one hydrogen atom attached to each carbon. Benzene was first discovered in 1825 from illuminating gas. It is a colorless, sweet-smelling liquid. Benzene's structure was discovered in the 1860s to be a closed ring of six carbon atoms with alternating single and double bonds. However, its electrons are delocalized across the whole ring. This delocalization and the presence of six π electrons is what gives benzene its aromatic properties.
Acidity of Phenols/OC -II PCI Syllabus/Effect of substituents on acidity of phenols
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Acidity of Phenols/OC -II PCI Syllabus/Effect of substituents on acidity of phenols
Hi dear students, in this video I had explained about acidity of Phenols and Effect of substituents on acidity of phenols. I had tried to explain all the points by animations. So don't hasitate to study now, See this video and you will come to know the facts about acidity and basicity of organic compounds. After watching this video it will be very easy to answer the following questions,
What are phenols?
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factors affecting acidity of phenols?
Pka of phenols?
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Introduction to benzene, orbital picture, resonance in benzene, Huckel‟s rule
Reactions of benzene - nitration, sulphonation, halogenation- reactivity, Friedel- Craft‟s alkylation- reactivity, limitations, Friedel-Craft‟s acylation.
Substituents, effect of substituents on reactivity and orientation of mono substituted benzene compounds towards electrophilic substitution reaction.
Benzene and its derivatives- According to PCI Syllabus Ganesh Mote
Benzene history, nomenclature, orbital structure, resonance structure, kekule structure,synthetic evidences, structural and analytical evidences, Directive effect of benzene, structure and uses of DDT, BHC, saccharine
Complexation and Protein Binding [Part-2](Method of analysis, Complexation a...Ms. Pooja Bhandare
Method of Analysis: Methods of continuous variation / JOB’S method of continuous variation.
pH titration method.
Distribution method.
Solubility method.
Spectroscopy and charge transfer complexation.
Miscellaneous method
Unit 1- Effects of substituents on Mono substituted benzene RingAnjali Bhardwaj
Effects of substituents on reactivity and orientation of monosubstituted benzene compounds towards electrophilic substitution reaction
Activating & Deactivating group
Ortho and Para Directing group
Meta directing group
substitution on the benzene ring
Halides are Ortho & Para directing group why?
Kekule structure and resonance in benzene PalakKhetan1
You will learn about Kekule structure of benzene with its obejections and resonance in benzene.
This will explain the unusual stability and equality of carbon carbon bond length.
Explanation for the lack of reactivity of benzene towards addition reaction.
In chemistry, aromaticity is a property of cyclic (ring-shaped), planar (flat) structures with pi bonds in resonance (those containing delocalized electrons) that gives increased stability compared to other geometric or connective arrangements with the same set of atoms. Aromatic rings are very stable and do not break apart easily. Organic compounds that are not aromatic are classified as aliphatic compounds—they might be cyclic, but only aromatic rings have enhanced stability.
Introduction to benzene, orbital picture, resonance in benzene, Huckel‟s rule
Reactions of benzene - nitration, sulphonation, halogenation- reactivity, Friedel- Craft‟s alkylation- reactivity, limitations, Friedel-Craft‟s acylation.
Substituents, effect of substituents on reactivity and orientation of mono substituted benzene compounds towards electrophilic substitution reaction.
Benzene and its derivatives- According to PCI Syllabus Ganesh Mote
Benzene history, nomenclature, orbital structure, resonance structure, kekule structure,synthetic evidences, structural and analytical evidences, Directive effect of benzene, structure and uses of DDT, BHC, saccharine
Complexation and Protein Binding [Part-2](Method of analysis, Complexation a...Ms. Pooja Bhandare
Method of Analysis: Methods of continuous variation / JOB’S method of continuous variation.
pH titration method.
Distribution method.
Solubility method.
Spectroscopy and charge transfer complexation.
Miscellaneous method
Unit 1- Effects of substituents on Mono substituted benzene RingAnjali Bhardwaj
Effects of substituents on reactivity and orientation of monosubstituted benzene compounds towards electrophilic substitution reaction
Activating & Deactivating group
Ortho and Para Directing group
Meta directing group
substitution on the benzene ring
Halides are Ortho & Para directing group why?
Kekule structure and resonance in benzene PalakKhetan1
You will learn about Kekule structure of benzene with its obejections and resonance in benzene.
This will explain the unusual stability and equality of carbon carbon bond length.
Explanation for the lack of reactivity of benzene towards addition reaction.
In chemistry, aromaticity is a property of cyclic (ring-shaped), planar (flat) structures with pi bonds in resonance (those containing delocalized electrons) that gives increased stability compared to other geometric or connective arrangements with the same set of atoms. Aromatic rings are very stable and do not break apart easily. Organic compounds that are not aromatic are classified as aliphatic compounds—they might be cyclic, but only aromatic rings have enhanced stability.
Benzene is a colorless and highly flammable liquid with a sweet smell, and is partially responsible for the aroma around petrol (gasoline) stations.
It is used primarily as a precursor to the manufacture of chemicals with more complex structure, such as ethylbenzene and cumene, of which billions of kilograms are produced annually.
Although a major industrial chemical, benzene finds limited use in consumer items because of its toxicity
General Chemistry of AROMATIC COMPOUNDS
CONTENTS:
-Aromatic compounds and aromaticity.
- Characteristic properties of aromatic compound.
- Nomenclature of derivatives of benzene.
- Benzene.
- Kekule’s structure of Benzene.
X-ray study of the structure of Benzene.
Molecular orbital description of benzene.
- Hückel 4n+2 Rule.
- Resonance of Benzene.
- Preparations of Benzene.
- Reactions of aromatic compound.
- Orientation in electrophilic substitution reactions.
Organic chemistry has two main divisions. One division deals with aliphatic (fatty) compounds, the first compounds you encountered in Organic Chemistry I. The second division includes the aromatic (fragrant) compounds, of which benzene is a typical example.
1. Introduction
2. History of benzene
3. Nomenclature
4. Orbital structure
5. Kekule structure
6. Resonance structure
7. Resonance energy and stability 8. Structural evidence
9. Synthetic evidence
10. Analytical evidence
11. Aromaticity and huckle rule
12. Method of preparation of benzene
13. Electrophilic substitution of benzene
14. Classification of substituent 15. Directive effect : Ortho and para director, meta director
16. Reaction of monosubstituted benzene
17. Effect of Substituents on reactivity and orientation of monosubstituted benzene towards electrophilic substitution 18. Structure and uses of BHC,DDT, Saccharine and chloramine
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
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A brief information about the SCOP protein database used in bioinformatics.
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Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
2. BENZENE
Benzene is an organic chemical
compound with the molecular formula
C₆H₆. The benzene molecule is
composed of six carbon atoms joined in
a planar ring with one hydrogen atom
attached to each.
3. GENERAL PROPERTIES OF BENZENE
:-
Chemical formula :-C6H6
Appearance:-Colorless liquid
Odor:- Sweet aromatic
Melting point:-5.53 °C (41.95 °F;
278.68 K)
Boiling point:-80.1 °C (176.2 °F; 353.2 K
4. Discovery Of Benzene:-
*Benzene was first discovered by the English
scientist Michael Faraday from illuminating gas.(1825)
*The name benzene was given by German
Chemist Mitscherich in 1833.
*German chemists Joseph Loschmidt (in 1861)
and August Kekule von Stradonitz (in
1866) discovered its shape.
* American professor Linus Pauling proposed that
benzene exhibited a hybrid structure composed
of delocalized electrons.
5. STRUCTURE OF BENZENE:-
• Benzene is a closed ring of six carbon
atoms linked by bonds that alternate
between single and double bonds.
• According to MOT, benzene ring
involves the formation of three
delocalized π – orbitals spanning all six
carbon atoms, while the valence bond
theory describes two stable resonance
structures for the ring.
6. Resonance of Benzene:-
The oscillating double bonds in the benzene ring are
explained with the help of resonance structures as per
valence bond theory.
The hybrid structure is represented by inserting a
circle in the ring as shown below in the figure.(fig.was
proposed by kalke for benzene)
7. Aromaticity of Benzene:-
Benzene (aromatic compound) as the C-C
bonds formed in the ring are not exactly
single or double, rather they are of
intermediate length.
HUCKLE RULE :-
According to Huckel rule, for a ring to be aromatic it should
have the following property:
*Planarity
*Complete delocalization of the π electrons in the ring
*Presence of (4n + 2) π electrons in the ring where n is an
integer (n = 0, 1, 2, . . .) ..