Answer:
The answer to your question is: 1.21 A°
Step-by-step explanation:
Ethene has 1 double bond between its carbons and a single bonds between Carbon and Hydrogens
Structure of ethene
H₂C = CH₂
The length of single bonds is 1.42 A°
The length of double bonds is 1.21 A°
The length of triple bonds is 1.10 A°