Geometrical Isomerism: When Structure Changes Everything

The video tutorial explains CIS-Trans nomenclature, focusing on geometrical isomerism. It covers the spatial arrangement of groups around carbon-carbon double bonds, using 2-butene as an example to illustrate CIS and Trans isomers. The tutorial also discusses geometrical isomers in cyclohexene, highlighting the stability of CIS isomers and the instability of Trans isomers in cyclic compounds. However, it notes that Trans isomers can exist in higher cycloalkenes like cyclodecene.

What is the primary difference between two isomers that exhibit geometrical isomerism?

• The presence of a triple bond

• The number of carbon atoms

• The spatial arrangement of groups around a double bond

• The type of chemical bonds present

In the case of 2-butene, what distinguishes the CIS isomer from the trans isomer?

• The trans isomer has no methyl groups.

• The CIS isomer has methyl groups on the same side of the double bond.

• The CIS isomer has methyl groups on opposite sides of the double bond.

• The trans isomer has methyl groups on the same side of the double bond.

Which type of isomerism is exhibited by 2-butene?

• Conformational isomerism

• Structural isomerism

• Geometrical isomerism

• Optical isomerism

Why is the trans isomer of cyclohexene generally not stable?

• It is too small in size.

• It has a strained arrangement.

• It has too many hydrogen atoms.

• It lacks a double bond.

In higher cycloalkenes like cyclodekene, why does the trans isomer exist?

• It is less strained due to a larger ring size.

• It has no double bonds.

• It forms a triple bond.

• It has fewer carbon atoms.