Question

Is CH2=CBrCH3 compound exist as cis-trans isomers or does not, explain

Answer 1

The compound CH₂=CBrCH₃, known as allyl bromide or 3-bromopropene, has a structure that allows for the possibility of cis-trans isomerism (geometric isomerism). This type of isomerism occurs in alkenes when there are different substituents attached to the double-bonded carbon atoms, leading to distinct spatial arrangements.

In CH₂=CBrCH₃, there are two carbon atoms involved in the double bond (C=C), specifically:

- The first carbon (C1) has two hydrogen atoms (H₂) attached.
- The second carbon (C2) is bonded to a bromine atom (Br) and a methyl group (CH₃).

For cis-trans isomerism to occur, both carbon atoms in the double bond need to have different substituents. In this case:

- Carbon C1 (with two H atoms) has no distinct substituents that would create geometric isomerism.
- Carbon C2 has two different groups: Br and CH₃.

Because one carbon has two identical hydrogen atoms, we cannot have distinct geometrical arrangements that define cis or trans forms. Therefore, **CH₂=CBrCH₃ does not exhibit cis-trans isomerism**. Instead, it can exist only as a single geometric form.

In summary, CH₂=CBrCH₃ does not exhibit cis-trans isomerism due to the presence of identical substituents on one of the carbon atoms involved in the double bond.