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Chapter 1.7 ­ The Alkenes

In a carbon-carbon single bond, also known as a sigma bond, the electron cloud is symmetrical about
the central axis of the molecule. The sigma bond can rotate about this axis.

The carbon-carbon double bond in ethane involves a sigma bond and a bond, whose…

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E.g. 1-bromo-2-chloro-2-fluoro-1-iodoethane

Br F Br Cl


C C C C

I Cl I F

From `I' and `Br', the `I' has the higher priority The high priority groups (F and Cl) are
because it's got the higher atomic number. From on opposite sides so it's an E-isomer.
Cl and F,…

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Reactions between alkenes and hydrogen halides ­

E.g.
H H H H


C C + HBr H C C H

H H H Br
E.g.
H H H


H H C C H

1-bromopropane
H H H H Br


H H C C + HBr
H H H

H H…

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In reactions involving alkenes, the electron pair of the bond froms a new bond with an electrophile
(positively polarised attacking group).

E.g.

H H H H


C C H C C H


H H H Br¯


The 2 electrons in H Br
the bond form
a bond with the
The…

Comments

sopi

THANKS !!! your notes are clear and easy to  remember :)

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