Structural formula of lycopene has to be drawn showing the two sets of four isoprene units linked to form lycopene. Concept Introduction: Terpenes are made by joining five-carbon units, usually in a head to tail-fashion. Isoprene unit: Branched end of isoprene – Head Unbranched end of isoprene - Tail

Question

Is this aromatic?

Answer 1

Question

Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 5, Problem 5.30P

(a)

Interpretation Introduction

Interpretation:

Structural formula of lycopene has to be drawn showing the two sets of four isoprene units linked to form lycopene.

Concept Introduction:

Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.

Isoprene unit:

Branched end of isoprene – Head

Unbranched end of isoprene - Tail

(b)

Interpretation Introduction

Interpretation:

Number of double in lycopene that has a possibility of cis, trans isomerism has to be given and the double bond that shows cis and that shows trans isomers has to be identified.

Concept Introduction:

Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.

Isoprene unit:

Branched end of isoprene – Head

Unbranched end of isoprene - Tail

Alkene: Unsaturated hydrocarbons having at least one double bond between two carbon atoms are known as alkenes.

• Trans configuration: In trans configuration, carbon atoms present in the main chain are placed on opposite sides of the carbon-carbon double bond.

• Cis configuration: In cis configuration, carbon atoms present in the main chain are placed on same sides of the carbon-carbon double bond.

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Is this aromatic?

CHEM2323 E Tt PS CH03 Draw and name all monobromo derivatives of pentane, C5H11Br. Problem 3-33 Name: Draw structures for the following: (a) 2-Methylheptane (d) 2,4,4-Trimethylheptane Problem 3-35 (b) 4-Ethyl-2,2-dimethylhexane (e) 3,3-Diethyl-2,5-dimethylnonane (c) 4-Ethyl-3,4-dimethyloctane 2 (f) 4-Isopropyl-3-methylheptane KNIE>

Problem 3-42 Consider 2-methylbutane (isopentane). Sighting along the C2-C3 bond: (a) Draw a Newman projection of the most stable conformation. (b) Draw a Newman projection of the least stable conformation. Problem 3-44 Construct a qualitative potential-energy diagram for rotation about the C-C bond of 1,2-dibromoethane. Which conformation would you expect to be most stable? Label the anti and gauche conformations of 1,2- dibromoethane. Problem 3-45 Which conformation of 1,2-dibromoethane (Problem 3-44) would you expect to have the largest dipole moment? The observed dipole moment of 1,2-dibromoethane is µ = 1.0 D. What does this tell you about the actual conformation of the molecule?

Answer 2

Question

Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 5, Problem 5.30P

(a)

Interpretation Introduction

Interpretation:

Structural formula of lycopene has to be drawn showing the two sets of four isoprene units linked to form lycopene.

Concept Introduction:

Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.

Isoprene unit:

Branched end of isoprene – Head

Unbranched end of isoprene - Tail

(b)

Interpretation Introduction

Interpretation:

Number of double in lycopene that has a possibility of cis, trans isomerism has to be given and the double bond that shows cis and that shows trans isomers has to be identified.

Concept Introduction:

Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.

Isoprene unit:

Branched end of isoprene – Head

Unbranched end of isoprene - Tail

Alkene: Unsaturated hydrocarbons having at least one double bond between two carbon atoms are known as alkenes.

• Trans configuration: In trans configuration, carbon atoms present in the main chain are placed on opposite sides of the carbon-carbon double bond.

• Cis configuration: In cis configuration, carbon atoms present in the main chain are placed on same sides of the carbon-carbon double bond.

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Answer 3

Question

Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 5, Problem 5.30P

(a)

Interpretation Introduction

Interpretation:

Structural formula of lycopene has to be drawn showing the two sets of four isoprene units linked to form lycopene.

Concept Introduction:

Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.

Isoprene unit:

Branched end of isoprene – Head

Unbranched end of isoprene - Tail

(b)

Interpretation Introduction

Interpretation:

Number of double in lycopene that has a possibility of cis, trans isomerism has to be given and the double bond that shows cis and that shows trans isomers has to be identified.

Concept Introduction:

Terpenes are made by joining five-carbon units, usually in a head to tail-fashion.

Isoprene unit:

Branched end of isoprene – Head

Unbranched end of isoprene - Tail

Alkene: Unsaturated hydrocarbons having at least one double bond between two carbon atoms are known as alkenes.

• Trans configuration: In trans configuration, carbon atoms present in the main chain are placed on opposite sides of the carbon-carbon double bond.

• Cis configuration: In cis configuration, carbon atoms present in the main chain are placed on same sides of the carbon-carbon double bond.

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Answer 4

Question

Definition Definition Molecules that have multiple bonds between their carbon atoms. Alkenes are hydrocarbons with a double bond between two adjacent carbon atoms (R 2 C=CR 2 ), whereas alkynes are hydrocarbons with a triple bond between two adjacent carbon atoms R-C=C-R . These two groups are known as unsaturated hydrocarbons. They have fewer hydrogen atoms when compared with alkanes with same number of carbon atoms. The general molecular formula for an unsaturated hydrocarbon can be represented as C n H 2n +2 .

Chapter 5, Problem 5.30P

(a)

Interpretation Introduction