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Organic Chemistry C H E 111 Lecture 7: Alkenes and Geometric Isomerism

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Questions and Answers

In which of the following cases can geometric isomerism be observed in alkenes according to the given text?

When each carbon of the C=C double bond is attached to two identical atoms or groups
When there is free rotation around the single bond
When each carbon of the C=C double bond is attached to two different atoms or groups (correct)
When the atoms are arranged to give different functional groups

Which of the following conditions must be met for a molecule to exhibit geometric isomerism?

There should be no rotation around the double bond
The position of the same functional group is different
The atoms are arranged to give different functional groups
Each carbon of the C=C double bond should be attached to two different atoms or groups (correct)

Why does 1-butene not have geometric isomerism?

Because there is free rotation around the single bond
Because one carbon of the C=C double bond is attached to two identical groups (correct)
Because the atoms are arranged to give different functional groups
Because there is no rotation around the double bond

Which naming system is used to assign the geometric configuration of alkenes with three or four substituents other than hydrogen?

E-Z system (D) Signup and view all the answers

In the E-Z system, how are substituents on each of the double-bond carbons ranked?

(Lower) (Lower) (CH3 > H) (Cl > CH3) (Higher) (Higher) (B) Signup and view all the answers

In IUPAC nomenclature of alkenes, how should the parent name be determined?

By selecting the longest chain that contains the double bond and changing the ending of the name of the alkane of identical length from –ane to -ene (B) Signup and view all the answers

How should substituted cycloalkenes be numbered in IUPAC nomenclature?

Number in a way that gives the carbon atoms of the double bond the 1 and 2 positions, and gives substituent groups lower numbers at the first point of difference (D) Signup and view all the answers

What is the general formula for alkenes (Olefins)?

$C_nH_{2n}$ (B) Signup and view all the answers

How are substituent groups indicated in the IUPAC nomenclature of alkenes?

By using the number of the carbon atoms to which they are attached (D) Signup and view all the answers

How should alkenes be numbered to include both carbon atoms of the double bond?

Begin numbering at the end of the chain nearer to the double bond (C) Signup and view all the answers

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