Overview
Your Name: Kose21nna
Alkynes have a very interesting structure as they consist of a sigma bond and two separate pi bonds to make up the overall triple bond characteristic of the alkyne functionality.
pKa = 25
homero
1.Consider the structures below and discuss the reason for the different pKa values being indicated for the C-H bond of a terminal alkyne vs. vinyl C-H (alkene) vs. alkyl C-H bond. From these values it is clear that the terminal alkyne is most acidic (lower pka). Your discussion needs to address the reason why rather than simply say "because the pka is lower". Why is the pka lower?
Terminal Alkynyl C-H
pka voalues tell
VS.
The lower the
The Carbon - carbon bon d
making
pka the more
pka = 44
Vinyl C-H
the acid strength, there fore it tells the level the solution is.
triple bond break double VS Or
Oue22
aidic
VS.
Aciditu decreases as electronegatwty de ereases
1
pKa = 50
Alkyl C-H
Alkynul C-H is more electr oneaatie
so it will take more energy to Single bonds.
by looking at hy br'idization
1t More audc
acdity Can e deter mined
S characBer is higher acisity