Carbon compounds as fuels and feedstock

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Question 11
Medium

This question is about hydrocarbons and chemical cracking.

a.

Alkanes are saturated hydrocarbons with a general molecular formula of CnH2n+2C_nH_{2n+2}Cn​H2n+2​. Which of the following molecular formulas represents an alkane? (a) C4H8C_4H_8C4​H8​ (b) C6H12C_6H_{12}C6​H12​ (c) C8H18C_8H_{18}C8​H18​ (d) C10H20C_{10}H_{20}C10​H20​

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b.

Describe the typical reaction conditions necessary to carry out the catalytic cracking of long-chain hydrocarbons.

[2]
c.

Complete the following equation for the cracking of octadecane (C18H38C_{18}H_{38}C18​H38​): C18H38→C13H28+____C_{18}H_{38} \rightarrow C_{13}H_{28} + \text{\_\_\_\_}C18​H38​→C13​H28​+____

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d.

Explain why the reactant C18H38C_{18}H_{38}C18​H38​ has a significantly higher boiling point than the product C13H28C_{13}H_{28}C13​H28​.

[2]

Carbon compounds as fuels and feedstock Questions

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