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Class 11 Chemistry Notes GOC – Resonance

by Anand Meena
April 22, 2019
in 11th Class, Class Notes
Reading Time: 3min read
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Class 11 Chemistry Notes General Organic Chemistry - AglaSem
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When one structure is not sufficient (enough) to explain each and every property (chemical & physical) then, different structure has been drawn which are known as Resonating Structure (canonical structure).
All these structure contribute to the formation of Real structure, known as Resonating Hybrid.

Hybrid

Condition for Showing Resonance:

  • Molecule should be planer, nearly planer or a part of it is planer


Q.1 Which is planer?

C and D Because they are sp2 hybridized.

Molecule should posses’ conjugated system

Conjugated system:-

  • Continuous Unhybridized p-orbital parallel to each-other.

Types of conjugated system:-

(1) π-bind alternate to π-bond

 CH2 = CH – CH = CH2
(2) π-bond alternate to + charge
CH2=CH        –    CH2+
Eg.
Eg.
Eg.
Eg.
E.g.

Resonance takes place due to delocalization of π e-

Position of the atoms remains the same; only delocalization of π e- takes place.

Note: – 

[They are net resonating structure rather they are tautomer]
Bond pair gets converted into lone pair and lone pair get converted into bond pair.

In Resonance No. of unpaired e- remains the same

(They are not resonating structure)

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Tags: 11 Chemistry11 Class ChemistryCBSE 11 NotesCBSE NotesChemistry for Class 11Class 11 NotesClass 11thClass 11th NotesClass XI ChemistryFree NotesXI Class

Anand Meena

Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics.

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