The alkene shown is protonated by acid at the carbon that gives the more stable carbocation. Count the number of hydrogens on sp3 carbons directly attached to the positively charged carbon of that cation. Give your answer as an integer.

Numerical answer type, tolerance 0.5.

Answer: 8

The alkene shown is 2-methylbut-2-ene. Protonation of the CH carbon gives the tertiary 2-methylbut-2-yl cation. Its charged carbon bears two CH3 groups (6 H) and one CH2CH3 group, whose CH2 gives 2 H. The total is 8 (checked with RDKit).

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