Hydrocarbons

Hydrocarbons Class 11 NEET Physics deals with:

Conformational Isomerism

It arises due to free rotation around C – C bond. We can define it as:

Definition: The different arrangement of atoms in space which can be obtained due to rotation about

C – C bond are called Conformation. It is not totally free but there is energy barrier of 120kJ/mol that has to be overcome.  This is called torsion strain that exist between two forms.

Conformations of ethane: There are two projections.

•      Sawhorse projection: In this H and C are bonded to each other and is represented in form of lines.

•     Newman projection: In this carbon is represented by drawing circles and hydrogen are represented by drawing lines as shown.                                            

The two form of new man projection are: eclipsed and staggered

•     Staggered: In this hydrogen are far apart from each other

•     Eclipsed: this hydrogen are just at back of each other

When staggered is rotated by 600 we get eclipsed form .In this: 600 -torsional angle .Torsional angle is angle by which one form is rotated to get the other form.

Torsional strain: It is the repulsive force that acts and give differnt stability of different forms .

The difference in their energy is given above and this is easily overcome and they keep inter converting.

Alkynes

 In this triple bond is present between carbon atoms (C  C  bond).The hybridisation is sp and the general formula involved is C_nH_2n -2.

•     The lowest member of alkynes is: simplest compound that is CH  CH (ethyne).

•     The common name of it is acetylene.

•     It has high Bond dissociation energy, as there is triple bond present therefore the energy is high of the order 823 KJ/mol.

•     Due to this reason the acetylene is mixed with O₂ and the flame is used for welding purpose.

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Hydrocarbons NEET Physics NEET Chapter 13

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