This document discusses inductive effects, resonance, and hyperconjugation. It defines resonance structures as alternative arrangements of electrons that stabilize molecules, and describes how resonance hybrids depict delocalized electrons. It explains that inductive effects stabilize charges through sigma bond polarization from electronegative atoms. Finally, it describes how hyperconjugation delocalizes positive charges in carbocations through overlap of vacant p orbitals with adjacent carbon-hydrogen sigma bonds.
This presentation describes the concept of Hyperconjugation in simple words, gives definition of hyperconjugation, explains why it is called as 'No bond Resonance' and gives the effects of hyperconjugation on the chemical properties of compounds: alkyl cations and their relative stability, alkyl radicals and their relative stability, alkenes and their relative stability, bond length, anomeric effect and Baker - Nathan effect.
This presentation describes the concept of Hyperconjugation in simple words, gives definition of hyperconjugation, explains why it is called as 'No bond Resonance' and gives the effects of hyperconjugation on the chemical properties of compounds: alkyl cations and their relative stability, alkyl radicals and their relative stability, alkenes and their relative stability, bond length, anomeric effect and Baker - Nathan effect.
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
CONTENTS
INTRODUCTION
CONCEPTS OF WALSH DIAGRAM
APPLICATION IN TRIATOMIC MOLECULES
[IN AH₂ TYPE OF MOLECULES(BeH₂,BH₂,H₂O)]
INTRODUCTION
Arthur Donald Walsh FRS The introducer of walsh diagram (8 August 1916-23 April 1977) was a British chemist, professor of chemistry at the University of Dundee . He was elected FRS in 1964. He was educated at Loughborough Grammar School.
Walsh diagrams were first introduced in a series of ten papers in one issue of the Journal of the Chemical Society . Here, he aimed to rationalize the shapes adopted by polyatomic molecules in the ground state as well as in excited states, by applying theoretical contributions made by Mulliken .
Introductory PPT on Metal Carbonyls having its' classification,structure and applications.This is a basic level PPT specially prepared for UG/PG Chemistry students.
An organic species which has a carbon atom bearing only six electrons in its outermost shell and has a positive charge is called carbocation.
The positively charged carbon of carbocation is sp2 hybridized.
The unhybridized p-orbital remains vacant.
They are highly reactive and act as reaction intermediate.
They are also called carbonium ion.
Inductive Effect is the important topic in organic chemistry that gives us idea about electron withdrawing and accepting module of the specific group that determines the reactivity of the molecule or compound.
Classification Of Mechanisms, Ligand Substitution In Octahedral Complexes Without Breaking Metal-ligand Bond, Substitution Reaction In Square Planar Complexes, Factors Which Affect The Rate Of Substitution, Trans Effect (Labilizing Effect), Theories and applications Of Trans Effect
A brief introduction to lanthanide elements is given.
Order .ppts like this at <https://www.fiverr.com/anikmal/teamup-with-you-to-prepare-the-best-presentation>
Along with their physical and chemical properties are also shown. Helpful for quick understanding on lanthanide series.
CONTENTS
INTRODUCTION
CONCEPTS OF WALSH DIAGRAM
APPLICATION IN TRIATOMIC MOLECULES
[IN AH₂ TYPE OF MOLECULES(BeH₂,BH₂,H₂O)]
INTRODUCTION
Arthur Donald Walsh FRS The introducer of walsh diagram (8 August 1916-23 April 1977) was a British chemist, professor of chemistry at the University of Dundee . He was elected FRS in 1964. He was educated at Loughborough Grammar School.
Walsh diagrams were first introduced in a series of ten papers in one issue of the Journal of the Chemical Society . Here, he aimed to rationalize the shapes adopted by polyatomic molecules in the ground state as well as in excited states, by applying theoretical contributions made by Mulliken .
It is about molecular orbital theory specially mo diagram of diatomic atoms,their bond orders,bond lengths and stability and experimental evidences of ionisation energy from PES.
CONTENTS
INTRODUCTION
CONCEPTS OF WALSH DIAGRAM
APPLICATION IN TRIATOMIC MOLECULES
[IN AH₂ TYPE OF MOLECULES(BeH₂,BH₂,H₂O)]
INTRODUCTION
Arthur Donald Walsh FRS The introducer of walsh diagram (8 August 1916-23 April 1977) was a British chemist, professor of chemistry at the University of Dundee . He was elected FRS in 1964. He was educated at Loughborough Grammar School.
Walsh diagrams were first introduced in a series of ten papers in one issue of the Journal of the Chemical Society . Here, he aimed to rationalize the shapes adopted by polyatomic molecules in the ground state as well as in excited states, by applying theoretical contributions made by Mulliken .
Introductory PPT on Metal Carbonyls having its' classification,structure and applications.This is a basic level PPT specially prepared for UG/PG Chemistry students.
An organic species which has a carbon atom bearing only six electrons in its outermost shell and has a positive charge is called carbocation.
The positively charged carbon of carbocation is sp2 hybridized.
The unhybridized p-orbital remains vacant.
They are highly reactive and act as reaction intermediate.
They are also called carbonium ion.
Inductive Effect is the important topic in organic chemistry that gives us idea about electron withdrawing and accepting module of the specific group that determines the reactivity of the molecule or compound.
Classification Of Mechanisms, Ligand Substitution In Octahedral Complexes Without Breaking Metal-ligand Bond, Substitution Reaction In Square Planar Complexes, Factors Which Affect The Rate Of Substitution, Trans Effect (Labilizing Effect), Theories and applications Of Trans Effect
A brief introduction to lanthanide elements is given.
Order .ppts like this at <https://www.fiverr.com/anikmal/teamup-with-you-to-prepare-the-best-presentation>
Along with their physical and chemical properties are also shown. Helpful for quick understanding on lanthanide series.
CONTENTS
INTRODUCTION
CONCEPTS OF WALSH DIAGRAM
APPLICATION IN TRIATOMIC MOLECULES
[IN AH₂ TYPE OF MOLECULES(BeH₂,BH₂,H₂O)]
INTRODUCTION
Arthur Donald Walsh FRS The introducer of walsh diagram (8 August 1916-23 April 1977) was a British chemist, professor of chemistry at the University of Dundee . He was elected FRS in 1964. He was educated at Loughborough Grammar School.
Walsh diagrams were first introduced in a series of ten papers in one issue of the Journal of the Chemical Society . Here, he aimed to rationalize the shapes adopted by polyatomic molecules in the ground state as well as in excited states, by applying theoretical contributions made by Mulliken .
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Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
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Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
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Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
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This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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1. INDUCTIVE EFFECTS,
RESONANCE, & HYPER
CONJUGATION
Dr. Rajasekhar
Reddy A
K L COLLEGE OF PHARMACY,
KLEF DEEMED TO BE
UNIVERSITY
2. RESONANCE
For example, two valid Lewis structures can be drawn for the anion (HCONH)–
.
One structure has a negatively charged N atom and a C – O double bond; the
other has a negatively charged O atom and a C – N double bond.
These structures are called resonance structures or resonance forms. A
double headed arrow is used to separate two resonance structures.
A molecule with two or more resonance structures is said to be resonance
stabilized.
3. RESONANCE THEORY
Resonance structures are not real. An individual resonance structure
does not accurately represent the structure of a molecule or ion.
Only the hybrid does.
Resonance structures are not in equilibrium with each other. There
is no movement of electrons from one form to another.
Resonance structures are not isomers. Two isomers differ in the
arrangement of both atoms and electrons, whereas resonance
structures differ only in the arrangement of electrons.
4. For example, ions A and B are resonance structures because the
atom position is the same in both compounds, but the location of
an electron pair is different.
In contrast, compounds C and D are isomers since the atom
placement is different; C has an O – H bond, and D has an
additional C – H bond.
6. DRAWING RESONANCE STRUCTURES
Resonance structures A and B differ in the location of two electron pairs, so
two curved arrows
are needed.
To convert A to B, take the lone pair on N and form a double bond between C
and N.
7.
8. THE RESONANCE HYBRID
The resonance hybrid is the composite of all possible resonance
structures. In the resonance hybrid, the electron pairs drawn in
different locations in individual resonance structures are delocalized.
9. Two differences commonly seen are the position of a multiple bond
and the site of a charge.
The anion (HCONH)– illustrates two conventions for drawing
resonance hybrids.
10. INDUCTIVE EFFECT
Compare ethanol (CH3CH2OH) and 2,2,2-trifluoroethanol (CF3CH2OH), two
different compounds containing O – H bonds.
First draw both conjugate bases and then determine which is more stable.
Both bases have a negative charge on an electronegative oxygen, but the
second anion has three additional electronegative fluorine atoms.
These fluorine atoms withdraw electron density from the carbon to which
they are bonded, making it electron deficient.
Furthermore, this electron-deficient carbon pulls electron density through
σ bonds from the negatively charged oxygen atom, stabilizing the negative
charge. This is called an inductive effect
11. Inductive effects result because an electronegative atom stabilizes the negative charge of
the conjugate base. The more electronegative the atom and the closer it is to the site of
the negative charge, the greater the effect.
INDUCTIVE EFFECT
12. Inductive effects are electronic effects that occur through s bonds.
To stabilize a positive charge, electron-donating groups are needed.
Alkyl groups are electron donor groups that stabilize a positive
charge.
An alkyl group with several σ bonds is more polarizable than a
hydrogen atom, and more able to donate electron density.
Thus, as R groups successively replace the H atoms in CH3
+, the
positive charge is more dispersed on the electron donor R groups,
and the carbocation is more stabilized.
INDUCTIVE EFFECT: CARBOCATION
13.
14. HYPERCONJUGATION
A 3° carbocation is more stable than a 2°, 1°, or methyl carbocation
because the positive charge is delocalized over more than one atom.
Both carbocations contain an sp2 hybridized carbon, so both are
trigonal planar with a vacant p orbital extending above and below the
plane.
There are no adjacent C – H σ bonds with which the p orbital can
overlap in CH3
+, but there are adjacent C – H σ bonds in (CH3)2CH+.
15. The larger the number of alkyl groups on the adjacent carbons, the
greater the possibility for hyperconjugation, and the larger the
stabilization.
HYPERCONJUGATION