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Basic concepts and hydrocarbons

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Question 6

Hex-1-ene, CH2=CHCH2CH2CH2CH3\text{CH}_2\text{=CHCH}_2\text{CH}_2\text{CH}_2\text{CH}_3CH2​=CHCH2​CH2​CH2​CH3​, and hexa-1,5-diene, CH2=CHCH2CH2CH=CH2\text{CH}_2\text{=CHCH}_2\text{CH}_2\text{CH=CH}_2CH2​=CHCH2​CH2​CH=CH2​, are unsaturated hydrocarbons.

a.

Explain what is meant by the terms σ\sigmaσ-bond and π\piπ-bond.

[2]
b.

State the number of σ\sigmaσ-bonds and π\piπ-bonds present in one molecule of hexa-1,5-diene, CH2=CHCH2CH2CH=CH2\text{CH}_2\text{=CHCH}_2\text{CH}_2\text{CH=CH}_2CH2​=CHCH2​CH2​CH=CH2​.

[2]
c.

Describe the stepwise mechanism for the formation of the major product, including the formulas of the intermediate species and the final product.

[4]
d.

Explain, in terms of carbocation stability, why this major product is formed in preference to the minor product.

[3]

Basic concepts and hydrocarbons Questions

  1. A Level
  2. /Chemistry
  3. /Basic concepts and hydrocarbons