Ncert Exercises & Solutions

Write the strucutres of various carbocations that can be obtained from 2-methylbutane. Arrange these carbocations in order of increasing stability.

2-methyl butane has four different sets of equivalent H-atoms.

Removal of 1-1-1 atom from any of these equivalent sets gives four different carbocations.

Stability of corbocation decreases in the order

3 ° > 2 ° > 1 °

. So, III (

3 °

carbocation) is most stable followed by II (

2 °

carbocation). Out of I and IV (both are

1 °

carbocation) I has a CH₃ group at

β

-carbon while II has a CH₃ group at

α

-carbon. As +I-effect decreases with distance, hence IV is more stable than I. Therefore, the overall stability of these four carbocations increases in the order.

I < IV < II < III

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