METHYLACETYLENE - (74-99-7)

Introduction

Name: methylacetylene; propyne*; methyl acetylene; allylene
* IUPAC
CAS Number: 74-99-7
Chemical Formula: C3H4 or CHCCH3
Molar Mass: 40.06386 g
Mass Percent: C 89.936 %; H 10.063 % 

Classification

• organic • alkyne

Physical Properties


Boiling Point:*
-27.5°C 1 = 245.65 K = -17.5°F
-23.2°C 2 = 249.95 K = -9.76°F

* - 1 atm pressure

Bonding

Double Bonds: 0
Triple Bonds: 1
Sigma Bonds: 6
Pi Bonds: 2
Total: 8
Carboxyl Groups: 0
Hydroxyl Groups: 0
Hybridization: single bonded carbon is sp3; triple bonded carbons are sp
Bonding: polar covalent
Ionic Character: 10.61 %

For More Information

Sources

(1) - Estok, George K. Organic Chemistry: A Short Text; W.B. Saunders: Philadelphia, 1959; p 42.
(2) - Lide, David R. CRC Handbook of Chemistry and Physics, 84th ed.; CRC Press: Boca Raton, FL, 2003; p 3-488.