Mind Map Minor

8/3/2019 Mind Map Minor

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intro


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Hi FRIENDS !! Today we will learnabout naming of alkenes and its

physical properties..LETS BEGIN OUR JOURNEY!!


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intro


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Hi!!!!Do you all

know me??

I amPOLYSTREN

E


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Iripeningthe fruit


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WE ARE FROM

ALKENEGROUP


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Alkene is classified as unsaturatedhydrocarbon

Contain at least one carbon carbon

double bond General formula, C nH2n (n=1,2,3,.)

For example, C 2H4 - ethylene

About ALKENE


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WHAT is MY NAME???There are a lot of my name that you can identify.

Interesting right? Well, lets see the steps that youshould use to give my name

Step 1

Step 2

Step 3
http://step%201-naming%20alkene.docx/http://step%202-naming%20alkene.docx/http://step%202-naming%20alkene.docx/http://step%203-naming%20alkenes.docx/http://step%203-naming%20alkenes.docx/http://step%202-naming%20alkene.docx/http://step%202-naming%20alkene.docx/http://step%201-naming%20alkene.docx/


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http://advanced%20level%20chemistry%20random%20%27type%20in%20name%27%20nomenclature%20quiz%20on%20alkenes.htm/


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Now, letslearn some

alkeneproperties


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Compound alkene Physical stateC C Gases

C - C Liquids

C and above Solids

a) Physical stateAt room temperature (25C)

and atmospheric pressure


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SOLUBILITYInsoluble in water,

But soluble innonpolar solvent

due to the

electron-attracting sp 2

carbon.


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POLARITY

Chemical structure andfunctional group can

affect the polarity of alkenes compounds

The sp C is moreelectron withdrawing

than sp hybridzedorbital

Thus, it creates aweak dipole along

the substituentweak alkenly carbon

bond

Two individual dipolestogether form a net

molecular dipole

Trans the dipolecancel out

cis - cannot cancel out. Thus,has net dipole and has higher

boiling point than trans


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Boiling points of alkenesdepends on more

molecular mass (chainlength).

0o0oThe moreintermolecular mass isadded, the higher the

boiling point.

Hmm, giraffe Did you know why theboiling point increased

with increasing molecularmass?

Intermolecular forces of alkenes gets stronger withincrease in the size of the

molecules.


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But, how about thealkenes that have same

molecular mass but differin their structure?

O0o0To predict relative boilingpoints, we should look fordifferences in (1) hydrogen

bonding, (2) molecular weightand surface area and (3) dipole

moments..

For that compounds, weshould looks it surface

area. the more branchedalkenes, the more lower

its boiling points.

One things we should considerin determine the boiling points

of the compounds is itshydrogen bond. If it has

hydrogen bond, then it has thehighest boiling points. Same

goes with dipole moments.


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Compound Boiling points ( oC)Ethene -104

Propene -47Trans-2-Butene 0.9Cis-2-butene 3.7Cis 1,2-dichlorobutene 152Trans 1,2-

dichlorobutene

155

1-Pentene 30


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How about meltingpoint?

1. Melting points of alkenesdepends on the packagingof the molecules.

2. Alkenes have similarmelting points to that of alkanes,

3. However, in cis isomersmolecules are package ina U-bending shape,therefore, will display alower melting points tothat of the trans isomers.


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Lets See Some

ExampleCompound Melting Points ( 0C)Ethene -169

Propene -185Butene -1381-Pentene -165

Trans-2-Pentene -135

Cis-2-Pentene -180

1-Heptene -119


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Among of the followingsolvent, which solvent willmake alkenes dissolve?

a) HClb) water

c) CCl d) HSO


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1. What is the physical state of butene at room condition?

2. Did 2,3-dimethylhexenedissolves in water? Why?3. Why the boiling points of

octene is differ from butene?


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O0o0

We are LOST!!!

we need to do

some activity to goaway from here..Can you

help us??


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Do you want to continue??


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activity


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TRUE or FALSE??

Somebody help meplease


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1. Alkenes do not have functional group

2. Alkenes consist of carbon-carbondouble bond

3. The general formula for alkene is

CnH2n4. In naming the IUPAC name for

alkenes,1 st step is list the number of substituents according to theirposition in carbon chain

5. In alkenes, there is E-Z system

F

T

T

F

T


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6.

(E)-2-hydroxymethyl-2-butenoic acid

7. Branched alkenes provided lower boilingpoint compared to straight chain alkenes8. Alkenes is polar molecule9. Alkenes soluble in water10. Alkenes provide higher polarity than

alkanes11. Alkenes is less reactive than alkanes

HC COOH

C = CH CHOH f

f f

t

f

t


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activity


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CH2CH3

CH2CH3

Br

1,4-hexadiene

5-bromo-3-sec-butyl-1-pentene

CH2

CH3CH CHCH2CH CH2 4-bromo-1-ethylcyclo

hexene

CH3

Br CH2CH2CHCHCH2CH3

CH CH2

2,3-dimethyl-2-butene


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CH2CH

CH3

CH3CHCH2

HC = CH CH3

CH3 CH2CHCH2CH = C CH2CH3

CH3 CH3

H

CH3

CH3

CH3

2-methyl-1,4-cyclohexadiene

1,5-dimethylcyclopentene

cis-5-methyl-2-hexene

trans-5,7-dimethyl-3-nonene


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activity

A h f i


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Arrange the correct steps of namingan alkene

d) Name the parent hydrocarbon by locating the longest carbonchain that contains the double bond and name it according to thenumber of carbons with the suffix -ene.

c) Number the carbons of the parent chain so the doublebond carbons have the lowest possible numbers.

a) If the double bond is equidistant from each end, number so thefirst substituent has the lowest number

b) Write out the full name, numbering the substituents according to their

position in the chain and list them in alphabetical order.


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AnswerD, C, A, B


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Arrange the following alkenes withincreasing boiling points and explainwhy.

2-methylpentene, 1-hexene,2,3-dimetylbutene


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ANSWER2,3-dimetylbutene < 2-methylpentene

< 1-hexene

To predict relative boiling points, we should look for differences

in (1) hydrogen bonding, (2) molecular weight and surfacearea and (3) dipole moments.All of the compounds have same molecular mass and do not

have hydrogen bonds. So, we look into its surface area.Because 2,3-dimetylbutene is most branched than others,thus it has the lowest boiling points.

Between 2-methylpentene and 1-hexene, 1-hexene is notbranched, therefore it has the highest boiling point amongothers.


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WELL DONE SON.

YOU DID IT !!NOW YOU CAN

GO HOME..

YEYY!!!THANK YOU OLD

MAN..

NOW WE CANMEET MY FAMILY

AGAIN..THANKSFRIENDS

FORHELPING

US

AT LAST,,WEUNDERSTAND ONHOW NAMING OFALKENE AND ITS

PROPERTIES..


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Good bye friends!!!

I hope you all understandbetter about naming of

alkenes and its properties..


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REVISION Steps of naming an alkene Physical properties

1. Appearances

2. Density3. Solubility4. Polarity

5. Boiling Point6. Melting Point


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Mind Map Minor

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