Chapter 23, Problem 95A

Interpretation Introduction

Interpretation : To determine the correct statement about ethene.

Concept Introduction: Ethene is a hydrocarbon with a double bond hence it is called an alkene. Its structural formula is ${\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}$ . It has one double bond between both carbon atoms.

Answer to Problem 95A

Option C

Explanation of Solution

Ethene is an unsaturated hydrocarbon due to the presence of a double bond between both carbon atoms. The $\text{C-H}$ bond angle in ethene is ${117}^0$ . In ethene, the bond angle is expected to be ${120}^0$ but, due to the presence of pi-bond and the position of the pi-bond the bond angle is ${117}^0$. Ethene is a hydrocarbon with a double bond it is called an alkene. Aromatic compounds are those compounds that are cyclic in nature and also contain a delocalized pi-electron cloud. Ethene is not an aromatic compound because both carbons are attached covalently in a straight chain. The structure of ethene is:

  

Conclusion

Ethene is made up of carbon and hydrogen in which carbons are attached to each other covalently with a double bond. The number of carbons present in ethene is 2 and the minimum number of carbons required to form an aromatic or cyclic ring is three. Therefore, it is a non-aromatic compound.