Point of View

In due course of my learning and teaching chemistry, I have realised the value and connection of vocabulary and its correlation to the Chemistry/Science jargon. This post is to make one aware of how we learn while explaining things to others (and come to know new things…feel amazed/enlightened).

While innovating in teaching, I have been trying to make students LEARN to Learn rather than only understanding the subject. In this, emphasis is on the expression of the concept…which is in my way bit too elaborative (so much that sometimes I fear of losing the audience).

What this extravagance (mind you it takes a lot of energy) is all about?

This is to make the learner comfortable with each word I say during my conversation with the learner. While achieving this (tell them to use dictionary or search) a few connections are made.

Like when we say REACTION in terms of a chemical reaction, one can explain with the literal meaning of how we “React” to a stimulus. In a similar manner atoms and molecules “React”, when they come too close.

Do we react every time…NO, as is the case with atoms and molecules. They react when the energy criteria is fulfilled.

On similar lines, you can explain the thesis of Stability and Reactivity, or even Resistance.

Let me take you to the POINT…What I want to say?

While doing Stereochemistry lessons and going through some projection formulae (Lesson 2 on this Blog), particularly the slide below, I came to know how casually we use the word Point Of View.

Slide11

Let me explain this. While taking students to the different possible viewing angles I asked their Point Of View. Then the way I take English word meanings (extravagance you see), I asked them to describe Point Of View. The obvious quick answers were Perspective etc.

Now came the time, when they understood that I was talking about a POINT (see the eye in above image) from which they are VIEWing the molecule.

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Thus, we all knew by now what our Point Of Views were and how we can reach to amazing learnings while doing Science.

This is the astonishing power of words that we need to connect and make sense out of. As humans we are judged not only by our behaviour and mannerisms but also how we use words and then also connect them to stitch into a philosophy.

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Reaction Intermediates

Now that we know about various electronic effects, let’s learn the Intermediates found in organic chemistry reactions.

Courtesy: “CEC-UGC”

For this we must understand the difference between reaction intermediate and transition state.

Slide3.JPG

Starting with carbon intermediates, carbocation is the first one:

Slide4Answer is that: carbon when loses its shared pair of electrons (to Z as Z-) it only gives one electron to Z and hence Single + charge.

Similarly, if bonded pair is taken by carbon relieving a positive ion, a carbanion is formed.

Slide5When the shared pair is equally cleaved giving one electron to carbon, a free radical is formed.Slide6Slide7Slide8Two more intermediates:Slide9

Let’s start with Carbocation, structure, generation and stability:Slide10Slide11Slide12Slide13Slide14Slide15Slide16Slide17Slide18Slide19Slide20Slide21Slide22Slide23Slide24Slide25Slide26

For carbanions and free radicals:

Courtesy: “CEC-UGC”Slide3Slide4Slide5Slide6Slide7Slide8Slide9Slide10Slide11Slide12Slide13Slide14Slide15Slide16Slide17Slide18Slide19Slide20Slide21Slide22Slide23Slide24Slide25Slide26Slide27Slide28Slide29Slide30Slide32

Let’s now go through carbenes (video below at 48:44 min):

Courtesy: “CEC-UGC”

Slide1Slide2Slide3Slide4Slide5Slide6Slide7Slide8

For the content of Posts on the blog: Creative Commons Attribution 4.0 International license

 

Here we would know about the various effects due to the bonded pairs in organic molecules.
Types of electronic effects we would deal with are:

  1. Inductive
  2. Electromeric
  3. Mesomeric (or Resonance)

 

Courtesy: “CEC-UGC”

  • More Examples of Resonance
  • Hyperconjugative effects

Various types of reactions in organic chemistry are also introduced here:

 

Courtesy: “CEC-UGC”