Textbook Question
Identify the type of reaction for the following:
a.
b.
1361
views
13. Alkenes, Alkynes, and Aromatic Compounds
Intro to Addition Reactions
Multiple Choice
How many moles of reagent are needed for the addition of the following alkyne?
A
2 moles
B
3 moles
C
1 mole
D
4 moles
Verified step by step guidance1
Identify the functional group in the given alkyne structure. The structure contains a carbon-carbon triple bond, which is characteristic of alkynes.
Understand that the addition of hydrogen (H2) to an alkyne involves a hydrogenation reaction, where the triple bond is converted to a single bond through the addition of hydrogen atoms.
Recognize that each carbon-carbon triple bond can be fully hydrogenated to a single bond by the addition of two moles of hydrogen (H2). This is because each pi bond in the triple bond requires one mole of H2 to be converted to a single bond.
Count the number of pi bonds in the alkyne. A carbon-carbon triple bond consists of one sigma bond and two pi bonds.
Conclude that to fully hydrogenate the alkyne to an alkane, two moles of H2 are required to add across the triple bond, converting it to a single bond.
Related Videos
Related Practice
