Chapter 2, Problem 2.61EP

(a)

Interpretation Introduction

Interpretation:

The given statement concerning 2-butene has to be identified as true or false.

Concept Introduction:

Organic compounds are represented shortly by the molecular formula and structural formula.  Each and every compound has its own molecular formula.  Compounds can have same molecular formula but not same structural formula.

Alkenes are linear chain unsaturated hydrocarbons and cycloalkenes are cyclic carbon chain unsaturated hydrocarbons.  They both occur naturally.

Alkenes and cycloalkenes are hydrocarbons.  They are nonpolar molecules.  Water is a polar molecule.  Therefore, alkenes and cycloalkenes do not get solubilized in water.  In other words, alkenes and cycloalkenes are insoluble in water.

Regarding density, alkenes and cycloalkenes have density lower than water.  When alkenes and cycloalkenes are mixed with water, two layers are formed which is a result of insolubility.  Alkenes and cycloalkenes are present on top of water layer which is due to lesser density.

Boiling point of alkenes and cycloalkenes increase with an increase in carbon‑chain length or the ring size.  The continuous chain alkenes which contain two to four carbon atoms are gases at room temperature.  The continuous chain alkenes that contain five to seventeen carbon atoms and one double bond are liquids at room temperature.

When branching happens in the carbon chain, it lowers the boiling point of alkenes.  In simple words, unbranched alkenes have more boiling point than branched alkenes with the same number of carbon atoms.

Cycloalkenes have more boiling point compared to noncyclic alkenes with the same number of carbon atoms.  This is due to the more rigid and more symmetrical structures that occur in cyclic systems.  Cyclopropene and cyclobutene are relatively unstable compound and gets converted into other hydrocarbons.

(b)

Interpretation Introduction

Interpretation:

The given statement concerning 2-butene has to be identified as true or false.

Concept Introduction:

Organic compounds are represented shortly by the molecular formula and structural formula.  Each and every compound has its own molecular formula.  Compounds can have same molecular formula but not same structural formula.

Alkenes are linear chain unsaturated hydrocarbons and cycloalkenes are cyclic carbon chain unsaturated hydrocarbons.  They both occur naturally.

Alkenes and cycloalkenes are hydrocarbons.  They are nonpolar molecules.  Water is a polar molecule.  Therefore, alkenes and cycloalkenes do not get solubilized in water.  In other words, alkenes and cycloalkenes are insoluble in water.

Regarding density, alkenes and cycloalkenes have density lower than water.  When alkenes and cycloalkenes are mixed with water, two layers are formed which is a result of insolubility.  Alkenes and cycloalkenes are present on top of water layer which is due to lesser density.

Boiling point of alkenes and cycloalkenes increase with an increase in carbon‑chain length or the ring size.  The continuous chain alkenes which contain two to four carbon atoms are gases at room temperature.  The continuous chain alkenes that contain five to seventeen carbon atoms and one double bond are liquids at room temperature.

When branching happens in the carbon chain, it lowers the boiling point of alkenes.  In simple words, unbranched alkenes have more boiling point than branched alkenes with the same number of carbon atoms.

Cycloalkenes have more boiling point compared to noncyclic alkenes with the same number of carbon atoms.  This is due to the more rigid and more symmetrical structures that occur in cyclic systems.  Cyclopropene and cyclobutene are relatively unstable compound and gets converted into other hydrocarbons.

(c)

Interpretation Introduction

Interpretation:

The given statement concerning 2-butene has to be identified as true or false.

Concept Introduction:

Organic compounds are represented shortly by the molecular formula and structural formula.  Each and every compound has its own molecular formula.  Compounds can have same molecular formula but not same structural formula.

Alkenes are linear chain unsaturated hydrocarbons and cycloalkenes are cyclic carbon chain unsaturated hydrocarbons.  They both occur naturally.

Alkenes and cycloalkenes are hydrocarbons.  They are nonpolar molecules.  Water is a polar molecule.  Therefore, alkenes and cycloalkenes do not get solubilized in water.  In other words, alkenes and cycloalkenes are insoluble in water.

Regarding density, alkenes and cycloalkenes have density lower than water.  When alkenes and cycloalkenes are mixed with water, two layers are formed which is a result of insolubility.  Alkenes and cycloalkenes are present on top of water layer which is due to lesser density.

Boiling point of alkenes and cycloalkenes increase with an increase in carbon‑chain length or the ring size.  The continuous chain alkenes which contain two to four carbon atoms are gases at room temperature.  The continuous chain alkenes that contain five to seventeen carbon atoms and one double bond are liquids at room temperature.

When branching happens in the carbon chain, it lowers the boiling point of alkenes.  In simple words, unbranched alkenes have more boiling point than branched alkenes with the same number of carbon atoms.

Cycloalkenes have more boiling point compared to noncyclic alkenes with the same number of carbon atoms.  This is due to the more rigid and more symmetrical structures that occur in cyclic systems.  Cyclopropene and cyclobutene are relatively unstable compound and gets converted into other hydrocarbons.

(d)

Interpretation Introduction

Interpretation:

The given statement concerning 2-butene has to be identified as true or false.

Concept Introduction:

Organic compounds are represented shortly by the molecular formula and structural formula.  Each and every compound has its own molecular formula.  Compounds can have same molecular formula but not same structural formula.

Alkenes are linear chain unsaturated hydrocarbons and cycloalkenes are cyclic carbon chain unsaturated hydrocarbons.  They both occur naturally.

Alkenes and cycloalkenes are hydrocarbons.  They are nonpolar molecules.  Water is a polar molecule.  Therefore, alkenes and cycloalkenes do not get solubilized in water.  In other words, alkenes and cycloalkenes are insoluble in water.

Regarding density, alkenes and cycloalkenes have density lower than water.  When alkenes and cycloalkenes are mixed with water, two layers are formed which is a result of insolubility.  Alkenes and cycloalkenes are present on top of water layer which is due to lesser density.

Boiling point of alkenes and cycloalkenes increase with an increase in carbon‑chain length or the ring size.  The continuous chain alkenes which contain two to four carbon atoms are gases at room temperature.  The continuous chain alkenes that contain five to seventeen carbon atoms and one double bond are liquids at room temperature.

When branching happens in the carbon chain, it lowers the boiling point of alkenes.  In simple words, unbranched alkenes have more boiling point than branched alkenes with the same number of carbon atoms.

Cycloalkenes have more boiling point compared to noncyclic alkenes with the same number of carbon atoms.  This is due to the more rigid and more symmetrical structures that occur in cyclic systems.  Cyclopropene and cyclobutene are relatively unstable compound and gets converted into other hydrocarbons.