It is observed that 2,3-dimethylbut-2-ene is significantly more stable than but-2-ene. Which of the following electronic effects is primarily responsible for this difference in stability?

Step-by-step solution

The stability of alkenes increases with the number of alkyl groups attached to the double-bonded carbon atoms. These alkyl groups stabilize the alkene primarily through hyperconjugation, which involves the delocalization of -electrons of the -C-H bonds into the empty ^ * antibonding orbital of the adjacent double bond. 2,3-dimethylbut-2-ene has 12 -hydrogens, leading to 12 hyperconjugative structures, whereas but-2-ene has only 6 -hydrogens. While the +I effect is also present, hyperconjugation is a stronger and mo