Question

In cumulene, what are the C=C=C and H?C?H bond angles, respectively?

Enter the C=C=C bond angle followed by the H?C?H bond angle separated by a comma.

Answer 1

Concepts and reason

In organic chemistry, cumulenes are the special class of hydrocarbon atoms in which the structure has three consecutive double bonds in its hydrocarbon chain. Cumulenes are analogous to the allenes. Butatriene is the member of this class of cumulene compounds.

Fundamentals

The structure of cumulene is given below:

The structure of cumulene has plane containing one terminal carbon is perpendicular to plane containing another terminal carbon.

The bond angle is labeled for cumulene, and it is depicted below:

The ${\rm{C = C = C}}$ bond angle is ${\rm{18}}{{\rm{0}}^{\rm{o}}}.$

The bond angle is labeled for cumulene, and it is depicted below:

The ${\rm{H}} - {\rm{C}} - {\rm{H}}$ bond angle is ${\rm{12}}{{\rm{0}}^{\rm{o}}}.$

Ans:

In cumulene, the ${\rm{C = C = C}}$ and ${\rm{H}} - {\rm{C}} - {\rm{H}}$ bond angles are ${\rm{18}}{{\rm{0}}^{\rm{o}}}{\rm{,12}}{{\rm{0}}^{\rm{o}}}$ , respectively.