Question

What is the relationship between the two terminal $H_{2}C=$ groups in a cumulene containing three consecutive double bonds?$(H_{2}C=C=C{H}_2)$

• A. They are in the perpendicular plane
• B. They are in same plane
• C. They are in two planes at ${120}^{\circ }$
• D. They are in two planes at ${109}^{\circ }$

Answer 1

Answer: (B)

They are in same plane

The two terminal $H_{2}C=$ groups (in a cumulene containing three consecutive double bonds $(H_{2}C=C=C{H}_2)$) are in the same plane.