<P> The central carbon atom of allene forms two sigma bonds and two pi bonds . The central carbon is sp - hybridized , and the two terminal carbon atoms are sp - hybridized . The bond angle formed by the three carbon atoms is 180 ° , indicating linear geometry for the carbon atoms of allene . It can also be viewed as an `` extended tetrahedral '' with a similar shape to methane . </P>
<P> The central carbon atom of allene forms two sigma bonds and two pi bonds . The central carbon is sp - hybridized , and the two terminal carbon atoms are sp - hybridized . The bond angle formed by the three carbon atoms is 180 ° , indicating linear geometry for the carbon atoms of allene . It can also be viewed as an `` extended tetrahedral '' with a similar shape to methane . </P>
the ccc bond angle in allene ( h2ccch2 ) is
the ccc bond angle in allene ( h2ccch2 ) is
180 °
180 °