MY CART (5)

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: R

There are no items in this cart.
Continue Shopping

X

“Hurray! You have won the gift voucher. Redeem your points now."

X

                   

please explain geometrical isomerisam in in alkenes with diagram for easily understandig

4 years ago

Share

Answers : (1)

                                        

Dear student,


Geometrical isomerism is a kind of stereoisomerism. The isomerism due to the difference in spatial arrangements of groups about the doubly bonded carbon atoms is known as Geometrical Isomerism.


For e.g., consider the structure of 2-butene.


Space Models


Space Models of 2-Butenes

 


fig.12.1 - Space Models of 2-Butenes


Note that the atoms are arranged in two different ways in I and II. The two CH3 groups lie on the same side in I and on the opposite sides in II. When two similar atoms or groups lie on the same side, the isomerism is called cis isomerism and the isomers are called cis isomers (cis means "on same side" in Latin). When two similar atoms or groups lie on opposite sides, the isomerism is called trans isomerism and the isomers are called trans isomers (trans means "across" in Latin). Geometrical isomerism is also called Cis-trans isomerism.


The carbon-carbon double bond in 2-butene consists of one sigma bond and one pie bond. The pie bond is formed by the lateral overlapping of p orbitals that lie above and below the sigma orbital plane. To pass from the cis form to the trans form, the molecule must be twisted so that the p orbitals don't overlap any more and the pie bond is broken. To break this pie bond, around 167.2KJ of energy is required. Therefore the conversion from one geometric isomer to another is very rare in 2-butene.


 


Hindered rotation about the carbon carbon double bond

 


fig.12.2 - Hindered rotation about the carbon carbon double bond


Similarly, maleic and fumaric acids exhibit geometric isomerism or they are geometric isomers.


maleic acid and fumaric acid are geometric isomers
4 years ago

Post Your Answer

More Questions On Organic Chemistry

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details
mole concept and n-factor
 
 
Check the links for mole concept and n factor http://www.askiitians.com/iit-jee-chemistry/physical-chemistry/some-basic-concept-of-chemistry/mole-concept.html...
  img
Avinash 5 days ago
In the following hypothetical reaction A + 3B   2C + D, initial moles of A is twice that of B. If at equilibrium moles of B and C are equal, % of B reacted is (A) 10% (B) 20% (C)...
 
 
A + 3B ----- 2C + D initially 1 1 0 0 let x moles of B be consumed at equillibrium equilli 1-x 1-3x 2x x given 1-3x=2x x=1/5 it means 3/5 moles are consumed which means 60 % Herre B is the...
 
Havishma Haranath 8 months ago
 
A + 3B ----- 2C + D initially 1 1 0 0 let x moles of B be consumed at equillibrium equilli 1-x 1-3x 2x x given 1-3x=2x x=1/5 it means 3/5 moles are consumed which means 60 % Herre B is the...
 
Havishma Haranath 8 months ago
 
A + 3B ----- 2C + D initially 1 1 0 0 let x moles of B be consumed at equillibrium equilli 1-x 1-3x 2x x given 1-3x=2x x=1/5 it means 3/5 moles are consumed which means 60 % Herre B is the...
 
Havishma Haranath 8 months ago
i am very confuse double bond/triple bond is preferred over ether or opposite happens plzz help me..
 
 
In IUPAC naming of organic compounds containing double/triple bond and ether functional group, priority is given to the double bond/triple bond over ether group.
  img
Pankaj 3 months ago
 
You are always welcome
  img
Pankaj 2 months ago
 
THank u Pankaj Sir
 
Mohammad Kavish 3 months ago
How many resonance structures exist for graphite?And what are they?
 
 
Hello Himaja There are tworesonance structures exist for graphite
  img
Pankaj 6 months ago
 
But the answer is three
 
Himaja 6 months ago
Why zinc sulphide screen is used inαscattering experiment
 
 
Hello dhruv, zinc sulphide releases a photon having wavelength of visible light when it is hit by a charged particle. in alpha scattering, alpha particles are scattered to different degree...
 
Neeti 4 days ago
 
You are most welcome, you could also approve the answer if you liked it :)
 
Neeti 4 days ago
 
Thanks for your an
 
Dhruv Desai 4 days ago
please generalise basic concepts related to atomic structure please explain
 
 
Atoms are made of small particles called protons, neutrons, and electrons. Each of these particles is described in terms of measurable properties, including mass and charge. Mass is the...
 
Gayatri Jayesh Bondriya 8 days ago
 
thanx for this help
 
parth bhail 8 days ago
View all Questions »