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What is the total number of isomers formed on monobromination of 2-methylbutane (including configurational and stereoisomers)?

I tried working it out. However, I found only five:

1:  1‐bromo‐2‐methylbutane; 2: 2‐bromo‐2‐methylbutane; 3: 2‐bromo‐3‐methylbutane; 4: 1‐bromo‐3‐methylbutane

According to the source, the answer is six. Which structure am I missing?

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    $\begingroup$ What’s the source? $\endgroup$ – kskinnerx16 May 27 at 20:02
  • $\begingroup$ One of the online practice questions i was doing $\endgroup$ – Vamsi Krishna May 28 at 8:32
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Here are the six structures that your source is probably referencing.

answer

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    $\begingroup$ Oh yes! I overlooked the fact that the first structure had a chiral carbon too! Thank you very much! $\endgroup$ – Vamsi Krishna May 28 at 6:01

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