Alkynes are hydrocarbons containing a carbon-carbon triple bond. They have the general formula CnH2n-2 and the bond angle around the triple bond is linear at 180 degrees. The triple bond consists of one sigma bond from overlapping s orbitals and two pi bonds from overlapping p orbitals. Unlike single bonds, triple bonds do not rotate freely due to the rigid nature of the pi bonds.

1. Alkynes
by Chandler Montgomery

2. Alkynes
• Alkynes- Hydrocarbons that • Triple bonds are made up of
have a triple bond between one sigma bond and two pi
two carbon atoms bonds. The sigma bond is the
• Have the general formula overlapping of the s orbitals of
CnH2n-2 the two atoms, while the pi
• The molecular geometry bonds are the overlapping of
around the C to C triple bond the two p orbitals.
in an alkyne is linear. Thus, the • A triple bond can only contain
bond angle around a triple one sigma bond because there
bond is 180° is only one s orbital in each
atom.
• Unlike C-C single bonds, C-C
triple bonds do not rotate
freely, because the two pi
bonds are not in between the
two nuclei.

3. Propyne 1-Butyne

4. 2-Butyne

5. • Alkynes are
also known
as
acetylenes,
because
ethyne
(C2H2) is also
called
acetylene.

6. Conclusion
• The main characteristic of alkynes
is their Carbon to Carbon triple
bond. This bond is linear and
includes one sigma and two pi
bonds.
Do you know any chemistry jokes?
-Yeah, I know alkynes of them!