Chapter 10, Problem 3MCP

(a)

Interpretation Introduction

Interpretation:

1-butene has one triple bond has to be indicated as true or false.

Explanation of Solution

1-butene is an unsaturated hydrocarbon.  Structure of 1-butene can be given as,

From the above structure it is found that 1-butene contains only a double bond and not a triple bond.  Hence, the given statement is false.

(b)

Interpretation Introduction

Interpretation:

1-butene has lower melting point than ethene has to be indicated as true or false.

Explanation of Solution

1-butene contains four carbon atoms and eight hydrogen atoms.  Ethene contains two carbon atoms and four hydrogen atoms.  As the molar mass increases, the London Dispersion forces become stronger and as a result melting and boiling points will also increase.  Hence, ethene will have lower melting point than 1-butene.  Therefore, the given statement is false.

(c)

Interpretation Introduction

Interpretation:

1-butene is an unsaturated hydrocarbon has to be indicated as true or false.

Explanation of Solution

Structure of 1-butene can be given as,

A double bond is present between two carbon atoms in the structure of 1-butene.  Therefore, 1-butene is an unsaturated hydrocarbon.  Hence, the given statement is true.

(d)

Interpretation Introduction

Interpretation:

1-butene is polar has to be indicated as true or false.

Explanation of Solution

1-butene contains four carbon atoms and eight hydrogen atoms.  The structure of 1-butene can be given as,

Pentane contains only carbon and hydrogen atom.  Therefore, this is a nonpolar molecule only.  Given statement is false.

(e)

Interpretation Introduction

Interpretation:

Molecular formula of 1-butene is ${\text{C}}_{\text{3}}{\text{H}}_{\text{6}}$ has to be indicated as true or false.

Explanation of Solution

1-butene contains four carbon atoms and eight hydrogen atoms.  The molecular formula of 1-butene is ${\text{C}}_{\text{4}}{\text{H}}_{\text{8}}$ and not ${\text{C}}_{\text{3}}{\text{H}}_{\text{6}}$.  Therefore, the given statement is false.

(f)

Interpretation Introduction

Interpretation:

1-butene is a liquid at room temperature has to be indicated as true or false.

Explanation of Solution

Alkenes with one to four carbon atoms are gases at room temperature.  1-butene contains four carbon atoms in its skeleton.  Hence, 1-butene is a gas at room temperature and not liquid.  Therefore, the given statement is false.

(g)

Interpretation Introduction

Interpretation:

Molar mass of 1-butene is $\text{42}\text{g/mol}$ has to be indicated as true or false.

Explanation of Solution

Molecular formula of 1-butene is ${\text{C}}_{\text{4}}{\text{H}}_{\text{8}}$.  Molar mass can be calculated as shown below,

    $\begin{array}{l}\text{Molar}\text{mass}\text{=}\text{4(C)}\text{+}\text{8(H)}\\ \text{=}\text{4(12}\text{.01)}\text{+}\text{8(1}\text{.008)}\\ \text{=}\text{48}\text{.04}\text{+}\text{8}\text{.064}\\ \text{=}\text{56}\text{.104}\text{g/mol}\end{array}$

Therefore, molar mass of 1-butene is $\text{56}\text{.104}\text{g/mol}$ and not $\text{42}\text{g/mol}$.  Hence, the given statement is false.

(h)

Interpretation Introduction

Interpretation:

Ionic bonding is present in 1-butene has to be indicated as true or false.

Explanation of Solution

1-butene is an organic compound.  It contains only hydrogen and carbon atoms.  Therefore, the bonds present between the atoms in 1-butene are covalent bonds only and not ionic bonds.  Hence, the given statement is false.

(i)

Interpretation Introduction

Interpretation:

Ionic bonding is flammable has to be indicated as true or false.

Explanation of Solution

1-butene is an organic compound.  All the hydrocarbons are flammable.  Hence, 1-butene is also flammable because it contains only carbon and hydrogen atoms.  The given statement is true.

(j)

Interpretation Introduction

Interpretation:

Functional group present in 1-butene is $-\text{OH}$ has to be indicated as true or false.

Explanation of Solution

1-butene is an organic compound.  Structure of 1-butene can be given as,

This do not contain hydroxyl group as its functional group.  It contains double bond as its functional group.  Hence, the given statement is false.

(k)

Interpretation Introduction

Interpretation:

1-butene is an aliphatic hydrocarbon has to be indicated as true or false.

Explanation of Solution

1-butene is an organic compound.  Structure of 1-butene can be given as,

1-butene do not contain any ring structure.  It contains only carbon and hydrogen atoms.  Therefore, 1-butene is an aliphatic hydrocarbon.  The given statement is true.