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Which does not contain an asymmetric carbon atom? A CH₃CH(CH₃)CH₂CH₃ B CH₃CH₂CH(CH₃)CH₂CH₃ C CH₃CH(OH)CH(OH)OH D CH₃CH₂CHClCH₃ - AQA - A-Level Chemistry - Question 26 - 2020 - Paper 3

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Question 26

Which-does-not-contain-an-asymmetric-carbon-atom?--A--CH₃CH(CH₃)CH₂CH₃--B--CH₃CH₂CH(CH₃)CH₂CH₃--C--CH₃CH(OH)CH(OH)OH--D--CH₃CH₂CHClCH₃-AQA-A-Level Chemistry-Question 26-2020-Paper 3.png

Which does not contain an asymmetric carbon atom? A CH₃CH(CH₃)CH₂CH₃ B CH₃CH₂CH(CH₃)CH₂CH₃ C CH₃CH(OH)CH(OH)OH D CH₃CH₂CHClCH₃

Worked Solution & Example Answer:Which does not contain an asymmetric carbon atom? A CH₃CH(CH₃)CH₂CH₃ B CH₃CH₂CH(CH₃)CH₂CH₃ C CH₃CH(OH)CH(OH)OH D CH₃CH₂CHClCH₃ - AQA - A-Level Chemistry - Question 26 - 2020 - Paper 3

Step 1

A CH₃CH(CH₃)CH₂CH₃

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Answer

The carbon in focus here is bonded to three distinct groups: a methyl group (CH₃), a propyl chain (CH₂CH₃), and a hydrogen atom. This carbon is asymmetric.

Step 2

B CH₃CH₂CH(CH₃)CH₂CH₃

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Answer

This carbon is bonded to a methyl group (CH₃), an ethyl group (CH₂CH₃), and a hydrogen atom, making it asymmetric.

Step 3

C CH₃CH(OH)CH(OH)OH

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Answer

The central carbons in this compound are each connected to different substituents, including hydroxyl groups, so these carbons are asymmetric.

Step 4

D CH₃CH₂CHClCH₃

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Answer

In this structure, the carbon bonded to chlorine (Cl) is also attached to two more hydrogen atoms and a CH₂ group. There are two identical hydrogen atoms attached, hence this carbon is symmetric.

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