1.

Which of the following will have the highest pKb value?

A. C<sub>6</sub>H<sub>5</sub>NH<sub>2</sub>
B. p-C<sub>6</sub>H<sub>5</sub>(CH<sub>3</sub>)NH<sub>2</sub>
C. p-C<sub>6</sub>H<sub>5</sub>(OCH<sub>3</sub>)NH<sub>2</sub>
D. p-C<sub>6</sub>H<sub>5</sub>(NH<sub>2</sub>)NH<sub>2</sub>
Answer» B. p-C<sub>6</sub>H<sub>5</sub>(CH<sub>3</sub>)NH<sub>2</sub>


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