Cis-Trans Isomerism in Alkene

This flashcard is used as revision materials after students learnt about Cis-Trans isomer in alkene.

What structural feature of alkenes is the reason for cis-trans isomerism?

The lack of rotation around the carbon-carbon double bond.

The carbon atoms involved in a double bond that exhibits cis-trans isomerism have what type of hybridization?

sp2 hybridization.

In the context of alkene isomerism, what does the prefix 'cis-' signify about the positions of substituent groups?

It signifies that the substituent groups are on the same side of the carbon-carbon double bond.

In the context of alkene isomerism, what does the prefix 'trans-' signify about the positions of substituent groups?

It signifies that the substituent groups are on opposite sides of the carbon-carbon double bond.

What is the specific IUPAC name for the isomer of butene where both methyl groups are on the same side of the double bond?

cis-2-butene.

In (E)-3-methyl-1,3-pentadiene, are the higher-priority groups on the relevant double bond on the same side or opposite sides?

They are on opposite sides, which is why it is designated E (entgegen).

The letter 'Z' in the E-Z system is derived from the German word zusammen, which means what?

Together.

The priority of each substituent in the E-Z system is determined by following the Cahn-Ingold-_____ (CIP) system.

Prelog

What is the name of the system that uses a set of sequence rules to assign priorities to substituent groups on double bond carbons?

The E-Z system.

The letter 'E' in the E-Z system is derived from the German word entgegen, which means what?

Opposite.

What is the specific IUPAC name for the isomer of butene where the methyl groups are on opposite sides of the double bond?

trans-2-butene.

In (Z)-2-hydroxymethyl-2-butenoic acid, are the higher-priority groups (-COOH and -H22OH) on the same side or opposite sides of the double bond?

They are on the same side, which is why it is designated Z (zusammen).