درس Chemistry Alkenes or olefins ثانوية عامة

Chemistry Alkenes or olefins
 

 
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Chemistry | Alkenes or olefins


Nomenclature of alkenes
(1) By using the same way in case of alkanes where we choose the longest continuous carbon chain. The suffix (ane)is replaced by the suffix (ene)in the name of alkene , preceding by the number of the carbon atom nearest to the double bond .
(2) Define the position of double bond according to the nearest carbon atom in the chain to the end, then write the position number of the double bond before the name of alkene.


Exercise (2)
Write the structural formula of the following organic compounds ?
(1) 4 – Bromo -1- butene.
(2) 1- Pentene.
(3) 3 – ethyl – 1- Pentene.
(4) 4,4dichloro , 3- heptene.
(5) 3 – methyl – 1 – butene.
(6) 4 ,Propyle – 2 – heptene.
(7) 4 chloro – 4 methyl – 2 – pentene.
 
Chemistry | Alkenes or olefins











Markownikoff's rule:
on adding Asymmetrical reagent such as acid halide (H+ X- ), water (H+ OH-) or suphuric acid (H+ OSO3H- ), to asymmetrical alkene , the positive part (H+), is added to the carbon atom which has a large number of hydrogen atoms, while the negative part is added to the carbon which has less number of hydrogen atoms.











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