Q15E - Chemistry (OpenStax)

Question

Write Lewis structures for the cis–trans isomers of \({\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CH = CHCL}}\)

Step-by-Step Solution

Answer

The graphic depicts the cis/trans isomers as a result. 

Step 1: Lewis structure means

A Lewis structure is a molecule’s structural depiction in which dots indicate electron locations surrounding the atoms and lines or dot pairs represent covalent interactions. The objective of creating a Lewis dot structure is to  aid detect chemical bonds formation by identifying lone electrons in molecules.

Step 2: Determining the Lewis structure for cis-trans isomers of \({\rm{C}}{{\rm{H}}_{\rm{3}}}{\rm{CH = CHCL}}\)

We contain four carbon atoms in our structure.

A double bond at carbon \({\rm{2}}\)  and a chlorine atom at carbon \({\rm{2}}\) are also present.

This indicates that we have \({\rm{2}}\)-chloro-\({\rm{2}}\)-butene on our hands.

Step 3: Geometric isomers of an alkene are cis/trans isomers.

The cis- isomer has the same identical groups on both sides of the double bond.

The trans-isomer has identical groups on opposing sides of the double bond.

Step 4: A cis- isomer structure depicted below

The cis- isomer, which possesses methyl groups on the same side of the double bond

Step 5: A trans- isomer structure depicted below

The methyl groups on the opposing ends of the double bond are found in the trans isomer.