Ethyne physical properties

The physical properties of alkynes (Table 9-2) are similar to those of alkanes and alkenes of similar molecular weights. Alkynes are relatively nonpolar and nearly insoluble in water. They are quite soluble in most organic solvents, including acetone, ether, methylene chloride, chloroform, and alcohols. Many alkynes have characteristic, mildly offensive odors. Ethyne, propyne, and the butynes are gases at room temperature, just... 

Multiple bonding is of considerable importance in carbon compounds and figure prominently in the chemical and physical properties of polymers. Two compounds need to be examined, ethyne (acetylene, C2H2) and ethene (ethylene, C2H4). 

The main physical properties of acetylene (ethyne) are shown in Table 8.2... 

The sp hybrid orbital has 50% s character, which is greater than the 33% and 25% s characters of the sp hybrid orbitals of alkenes and the sp and hybrid orbitals of alkanes. We recall that as the percent s character of hybrid orbitals increases the electrons in the hybrid orbitals are closer to the nucleus. Therefore, the bonding electrons in an sp hybrid orbital of a C—H bond in ethyne are closer to the nucleus than the electrons in the hybrid orbital of the C—H bonds of ethylene or ethane. The greater s character of the sigma bonds of acetylene and alkynes affects their physical properties. 

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