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Chapter 4: Q.64. (page 128)

Question: Draw the products of combustion of each alkane.

a.

b.

Short Answer

Expert verified

Answer

a.7CO2and8H2Ob.4CO2and5H2O

Step by step solution

01

Combustion reaction

In a combustion reaction, a substance burns in the presence of oxygen (excess of air) to give carbon dioxide gas and water as the only reaction products.

The products of combustion reactions always remain the same irrespective of the reactant materials. The initial substance undergoing the combustion reaction is generally called a fuel.

02

Combustion of alkanes

Combustion requires a flame or spark for the initiation of the reaction.

When alkanes undergo combustion, all of their C-H bonds and C-C bonds break to form new C-O bonds.

03

Combustion reactions of the given alkanes

a. The given compound 2-methylhexane reacts with the oxygen in the air to give seven moles of carbon dioxide gas and eight moles of water.


CH3-CH2-CH2-CH2-CHCH32+11O2→Flame7CO2+8H2O2-methylhexane


b. The given compound butane undergoes combustion to form four moles of carbon dioxide gas and five moles of water.


CH3-CH2-CH2-CH3+132O2→Flame4CO2+5H2O

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Most popular questions from this chapter

Question: Consider the substituted cyclohexane shown in the ball-and-stick model.

  1. Label the substituents on C1, C2, and C4 as axial or equatorial.
  2. Are the substituents on C1 and C2 cis or trans to each other?
  3. Are the substituents on C2 and C4 cis or trans to each other?
  4. Draw the second possible conformation in the chair form, and classify it as more stable or less stable than the conformation shown in the three-dimensional model.

Question: Which of the following is not another representation for 2-methylbutane?

a.

b.

c.

d.

Question: Give the IUPAC name for each compound.

Question: Hydrocarbons like benzene are metabolized in the body to arene oxides, which rearrange to form phenols. This is an example of a general process in the body, in which an unwanted compound (benzene) is converted to a more water-soluble derivative called a metabolite, so that it can be excreted more readily from the body.

a. Classify each of these reactions as oxidation, reduction, or neither.

b. Explain why phenol is more water soluble than benzene. This means that phenol dissolves in urine, which is largely water, to a greater extent than benzene.

Question: Give the structure and IUPAC name for each of the nine isomers having molecular formula C9H20that contains seven carbons in the longest chain and two methyl groups as substituents.
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