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Question 60

When one molecule of pentane (C5H12\text{C}_5\text{H}_{12}C5​H12​) is cracked, three of the possible reactions are:

Reaction 1: C5H12→C3H6+C2H6 \text{Reaction 1: } \text{C}_5\text{H}_{12} \rightarrow \text{C}_3\text{H}_6 + \text{C}_2\text{H}_6 Reaction 1: C5​H12​→C3​H6​+C2​H6​ Reaction 2: C5H12→C4H8+CH4 \text{Reaction 2: } \text{C}_5\text{H}_{12} \rightarrow \text{C}_4\text{H}_8 + \text{CH}_4 Reaction 2: C5​H12​→C4​H8​+CH4​ Reaction 3: C5H12→C5H10+H2 \text{Reaction 3: } \text{C}_5\text{H}_{12} \rightarrow \text{C}_5\text{H}_{10} + \text{H}_2 Reaction 3: C5​H12​→C5​H10​+H2​
a.

One product in each of these reactions is an alkene. What is the general formula for the homologous series of alkenes?

[1]
b.

What are the IUPAC names of the two products of Reaction 1?

[2]
c.

Identify the saturated product of Reaction 2 and write its molecular formula.

[2]
d.

The alkene product of Reaction 2, C4H8\text{C}_4\text{H}_8C4​H8​, has three main acyclic structural isomers that are alkenes. State the IUPAC names of these three isomers.

[3]
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Organic chemistry Questions

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