Chemistry · PYQ NEET UG 2020

A tertiary butyl carbocation is more stable than a secondary butyl carbocation because of which of the following?

1. +R effect of \( -\text{CH}_3 \) groups
2. –R effect of – \( \text{CH}_3 \) groups
3. Hyperconjugation
4. –I effect of –\( \text{CH}_3 \) groups