alkynes
TRANSCRIPT
![Page 1: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/1.jpg)
GROUP MEMBERS :
-MUHAMAD SAHLI B MUDA-NURUL HANA BALQIS BAHAROM-NAPSIAH ABDUL RAHMAN
![Page 2: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/2.jpg)
ALKYNESNaming and physical properties of alkynes
![Page 3: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/3.jpg)
INTRODUCTION TO ALKYNES
Contain a C-CTriple bonds
Also called ACETYLENES bcoz
they are derivatives of acetylene, the simplest
alkyne
Hydrocarbon(only have C and H)
A triple bond gives alkynes 4 fewer H than
alkane.
Contributes two elements of unsaturation
![Page 4: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/4.jpg)
acetylene
ethylacetylene
dimethylacetylene
DERIVATIVE OF ACETYLENES
![Page 5: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/5.jpg)
ETHYNE
CnH2n-2
MOLECULAR FORMULA OF ALKYNES
GENERAL MOLECULAR
FORMULA
![Page 6: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/6.jpg)
NOMENCLATUREOF ALKYNES
![Page 7: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/7.jpg)
IUPAC names
Find longest continuous chain of carbon atoms includes the triple bond
Change the –ane ending of parent alkane to -yne
Chain is numbered from end closest to
triple bond
Substituents are given numbers to indicate
their locations
When additional func. Group present, suffix combined to produce compound names.
EXAMPLES
![Page 8: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/8.jpg)
H3C C
CH3
C C CH2 C CH3
Br
H H
2-butyne
Ethyne (acetylene)
6-bromo-2-methyl-3-heptyne
IUP
AC
NA
ME
OF
AL
KY
NE
S
![Page 9: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/9.jpg)
1-butyne or but-1-yne
5-methyl-2-hexyne or5-methylhex-2-yne
3-methyl-1-butyne
cyclohexylethyne
![Page 10: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/10.jpg)
1-penten-4-yne
3-butyn-2-ol
NAMING ALKYNES WHEN ADDITIONAL FUNCTIONAL GROUP ARE PRESENT
![Page 11: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/11.jpg)
COMMON NAME
Describe alkynes as derivatives of
acetylene
Can be named as molecule of acetylene with one or
two alkyl substituents
examples
![Page 12: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/12.jpg)
acetylene
dimethylacetylene
diphenylacetylene
COMMON NAME OF ALKYNES
![Page 13: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/13.jpg)
Terminal alkynes Internal alkynes
TYPE OF ALKYNES
1-butyne 2-butyne
VISUAL OF NAMING ALKYNES
EXERCISEnomenclature
![Page 14: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/14.jpg)
Click on the diagram to watch animation
![Page 15: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/15.jpg)
PHYSICAL PROPERTIESOF ALKYNES
CONTINUE
![Page 16: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/16.jpg)
PHYSICAL PROPERTIES OF ALKYNES
alkynes are non-polar and are insoluble in water but soluble in non-polar organic solvents.
Boiling PointsCompared to alkanes and
alkenes, alkynes have a slightly higher boiling point.
AcidityThe acidity of terminal alkynes
compared to alkenes and alkanes are stronger.
![Page 17: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/17.jpg)
PHYSICAL PROPERTIES OF
ALKYNES
Alkynes are colorless
Acetylene possesses a pleasant odor when
pure.
liquid acetylene is highly explosive.
![Page 18: ALKYNES](https://reader035.vdocuments.mx/reader035/viewer/2022081413/54730212b4af9ff1118b464c/html5/thumbnails/18.jpg)
LET’S THINK AND ANSWER
THE QUIZ!!
CLICK HERE TO ANSWER QUIZ