Propyne structural formula

Based on its root name and suffix, what is the structural formula of propyne ... 

Strategy Addition polymers, whether they are synthesized from alkenes or alkynes, form via a free-radical reaction in which one pair of pi electrons in the carbon-carbon multiple bond of a monomer molecule is used to form carbon-carbon single bonds to other monomer molecules. Draw the structural formula of propyne such that the triple bond can be opened up to form single bonds between consecutive monomer units. 

Setup The structural formula of propyne can be determined from the formula given and by analogy to acetylene. The only difference between propyne and acetylene is the CHj group in place of one of the hydrogen atoms ... 

We represent double and triple bonds in structural formulas with double or triple lines. For example, we draw the structural formulas for (propene) and C3H4 (propyne) as follows ... 

Alkynes An unsaturated hydrocarbon that contains one or more triple bonds between carbon atoms is called an alkyne. Alkynes with one triple bond have the general formula C H2 2. The simplest alkyne is ethyne (C2H2), which is commonly called acetylene. The next simplest alkyne is propyne (C3H4). Their condensed structural formulas are shown below. 

There are other alkyne compounds, but they do not have much commercial value, and will not be commonly encountered. A three-carbon compound with one triple bond has prop as a prefix for three carbons and is called propyne, with a molecular formula of C3H4 It is listed in the Condensed Chemical Dictionary as propyne, but you are referred to methylacetylene for information. It is listed as a dangerous fire risk, and it is toxic by inhalation. Propyne is used as a specialty fuel and as a chemical intermediate. A four-carbon alkyne has the prefix but, and the compound is called butyne, with the molecular formula of C4H6. The chemical listing is under the name ethylacetylene, and it is designated as a dangerous fire risk. It is also used as a specialty fuel and as a chemical intermediate. The following shows the structures for ethyne, propyne, and butyne ... 

In addition to propyne (see Follow-up Problem 10.8), there are two other constitutional isomers of formula C3H4. Draw a Lewis structure for each, determine the shape around each carbon, and predict any deviations from ideal bond angles. 

Propyne fHC=CCH3l can be u.sed to form an electrically conducting polymer. Draw the structure of polypropyne, showing at least three repeating units, and write the general formula for the polymen... 

Study the structures of ethyne, propyne, butyne, and other alkynes, and show that their formulas fit the general formula for alkynes, CnH2n 2-... 

A final point You could have derived the first resonance structure much more quickly hy considering the information given in the reaction scheme leading to the dianion. Thus, the bond-line formula of propyne represents its Lewis structure and the process of removing a proton each from the respective terminal carbons leaves these carbons with two lone electron pairs and the associated charges ... 

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