Question

Explain why ethene molecule is planar while ethyne is a linear.

Answer 1

Answer:because it is the first member of the alkene series of hydrocarbons.

Explanation:

Answer 2

Answer:

• Ethene is a ‘planar molecule’ and Ethyne is linear.

• All carbon atoms in ethene are sp-bonded. The molecular formula of ethene is $\mathrm{C}_{2} \mathrm{H}_{4}$ and the full form of this molecule is $C H_{2}=C H_{2}$.
• The total number of atoms in the ethene molecule is six.
• According to the ‘VSEPR’ theory the shape of the ethene is linear.  Ethyne the common name of this compound is acetylene and the molecular formula of this compound is $C H \equiv C H$.  

• In this compound two carbons are bonded by triple, the geometry is linear.