Basic concepts of organic chemistry

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Question 3
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This question is about hydrocarbons.

The structures of hydrocarbons A–E are shown below:

Five molecular structures of hydrocarbons, labelled A to E. Structure A: A four-membered ring (cyclobutane) with a single methyl group attached to one of the carbons. Structure B: A five-membered ring (cyclopentane) containing a double bond (cyclopentene), with a methyl group attached to one of the carbon atoms of the double bond. Structure C: A benzene ring with two methyl groups on adjacent carbons and an ethyl group positioned such that they are at positions 1, 2, and 4. Structure D: A skeletal structure of an alkene showing a carbon-carbon double bond, where the carbon on the left has a methyl group pointing down-left, and the carbon on the right has an ethyl group pointing up-right and a methyl group pointing down-right. Structure E: A skeletal structure of a terminal alkyne, pent-1-yne, showing a triple bond on the right end connected to a propyl group on the left.

a.

Which hydrocarbons are unsaturated?

[1]
b.

Which hydrocarbons are alicyclic?

[1]
c.

Which hydrocarbons have the general formula CnH2n\text{C}_n\text{H}_{2n}Cn​H2n​?

[2]
d.

What is the systematic name of hydrocarbon C?

[2]
e.

Explain why hydrocarbon D is an EEE-stereoisomer.

[2]

Basic concepts of organic chemistry Questions

  1. A Level
  2. /Chemistry
  3. /Basic concepts of organic chemistry