Which of the following numbered hydrogens is most easily abstracted by heterolytic cleavage? Explain. 
Definitions:
Pretax Income
The amount of income earned by an individual or corporation before taxes are deducted.
Benefits Principle
A taxation principle that states those who benefit from government services should pay in proportion to the amount they benefit.
Taxation
The system through which governments impose financial charges on citizens or corporates to fund public spending.
Tax Incidence
The study of the effect of a particular tax on the distribution of economic welfare, focusing on who ultimately pays the tax (the burden of the tax).
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