Question

Type of electronic transition observed in following compounds (a) ->C-X (b) >C=O

Answer 1

Carbonyl (C=O) Groups Tend To Show Weak Absorbances At (Roughly) 300 nm That Correspond To Transitions Between Non-Bonding Orbitals and Pi* Orbitals

Answer 2

Answer:

(a) n→σ* electronic transition is observed in ->C-X compounds.

(b) n→π* electronic transition is observed in >C=O compounds.

Explanation:

There are four types of electronic transitions.

They are :

1. σ→σ* transition
2. σ→σ* transitionn→σ* transition
3. σ→σ* transitionn→σ* transitionn→π* transition
4. σ→σ* transitionn→σ* transitionn→π* transitionπ→π* transition

σ→σ* transitionn→σ* transitionn→π* transitionπ→π* transitionσ→σ* transition:

1. This transition occurs when σ- electron is promoted to the antibonding σ* orbital.
2. It is a high energy process.
3. This type of transition is observed mostly in Saturated Hydrocarbon.

n→σ* transition:

1. When a non- bonding electron (n) gets promoted to the antibonding σ* orbital, then it represents n→σ* transition.
2. This transition takes place in the compounds in which unpaired electrons are present.
3. So this transition takes place in Saturated compounds containing one hetero atom, halides, alcohols,ethers, aldehydes,ketones etc .
4. So, n→σ* electronic transition is observed in ->C-X compounds as halides have nonbonding electrons

n→π* transition:

1. This transition represents the promotion of non-bonding (n) electrons to an antibonding π*orbital.
2. This transition occurs in Saturated Carbonyl compounds .
3. So, n→π* electronic transition is observed in >C=O compounds.

π→π* transition:

1. This transition represents the promotion of π electrons to an antibonding π*orbital.
2. This types of transition occurs in unsaturated compounds i.e. compounds containing double bond and triple bond.

For more information about electronic transition following links are provided:

https://brainly.in/question/1138098?

https://brainly.in/question/14639256?