Textbook Question
What is each compound's systematic name?
d.
e.
f.
4. Alkanes and Cycloalkanes
Naming Alkenes
4:58 minutesProblem 40a,b,c
Textbook Question
Draw a structure for each compound (includes old and new names).
a. 3-methylpent-1-ene
b. cis-3-methyl-3-hexene
c. 3,4-dibromobut-1-ene
Verified step by step guidance1
Step 1: Start with the first compound, 3-methylpent-1-ene. Identify the longest carbon chain, which is pentane (5 carbons). The '1-ene' indicates a double bond between the first and second carbon atoms.
Step 2: For 3-methylpent-1-ene, add a methyl group (CH₃) to the third carbon of the pentane chain. Ensure the double bond is between the first and second carbons.
Step 3: Move to the second compound, cis-3-methyl-3-hexene. Hexene indicates a 6-carbon chain with a double bond. The '3-hexene' specifies the double bond between the third and fourth carbons. 'Cis' means the substituents on the double-bonded carbons are on the same side.
Step 4: For cis-3-methyl-3-hexene, add a methyl group to the third carbon. Arrange the structure so that the methyl group and the hydrogen on the third carbon are on the same side as the hydrogen on the fourth carbon, maintaining the 'cis' configuration.
Step 5: Finally, for 3,4-dibromobut-1-ene, start with a butene chain (4 carbons) with a double bond between the first and second carbons. Add bromine atoms to the third and fourth carbons. Ensure the double bond is correctly placed between the first and second carbons.
Verified video answer for a similar problem:This video solution was recommended by our tutors as helpful for the problem above
Video duration:
4mWas this helpful?
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
IUPAC Nomenclature
IUPAC nomenclature is a standardized system for naming chemical compounds. It involves identifying the longest carbon chain, numbering the chain to give substituents the lowest possible numbers, and naming substituents as prefixes. Understanding this system is crucial for drawing structures from names, as it provides a clear method to identify the arrangement of atoms in a molecule.
Recommended video:
Guided course
03:43
The different parts of an IUPAC name
Alkene Structure
Alkenes are hydrocarbons containing at least one carbon-carbon double bond. The presence of this double bond affects the geometry and reactivity of the molecule. In drawing alkene structures, it's important to represent the double bond accurately and consider its position in the carbon chain, as indicated by the name, to ensure the correct molecular structure.
Recommended video:
1:59Alkene Metathesis Concept 5
Cis-Trans Isomerism
Cis-trans isomerism is a form of stereoisomerism where the relative orientation of functional groups around a double bond differs. 'Cis' indicates that substituents are on the same side, while 'trans' means they are on opposite sides. This concept is essential for understanding the spatial arrangement in molecules like cis-3-methyl-3-hexene, affecting their physical and chemical properties.
Recommended video:
Guided course
00:44Is the following cyclohexane cis or trans?
1:55mWatch next
Master How to name alkenes and alkynes with a bite sized video explanation from Johnny
Start learningRelated Videos
Related Practice