Question

Determine CIP priorities for the following compound -

• A. $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$ > H > D
• B. $-CH(C{H}_3{)}_2$ > $-C{H}_{2}C{H}_{2}C{H}_3$ > - D > - H
• C. $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$ > D > H
• D. D > H > $-C{H}_{2}C{H}_{2}C{H}_3$> $-CH(C{H}_3{)}_2$

Answer 1

The correct option is B $-CH(C{H}_3{)}_2$ > $-C{H}_{2}C{H}_{2}C{H}_3$ > - 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, $-CH(C{H}_3{)}_2$ > $-C{H}_{2}C{H}_{2}C{H}_3$ > - D > - H