Determine CIP priorities for the following compound -

- C H_{2} C H_{2} C H_{3}

- C H (C H_{3})_{2}

> H > D

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- C H (C H_{3})_{2}

- C H_{2} C H_{2} C H_{3}

> - D > - H

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- C H_{2} C H_{2} C H_{3}

- C H (C H_{3})_{2}

> D > H

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D > H >

- C H_{2} C H_{2} C H_{3}

- C H (C H_{3})_{2}

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Solution

The correct option is B $- C H (C H_{3})_{2}$ > $- C H_{2} C H_{2} C H_{3}$ > - D > - H
Let’s write it like this

Here, you need to know 2 things:

$\to$ The isotope with higher atomic mass is given higher priority.
$\to$ If the first atoms are the same, go to the next set.

Between

C, C, H > C, H, H

So, $- C H (C H_{3})_{2}$ > $- C H_{2} C H_{2} C H_{3}$ > - D > - H

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