Q. BS”D, Thank you Rabbi Bartfeld.  Can I please ask you two more questions, and that will be It.  Why did the serpent first approach Eve instead of Adam? 

A. Rashi (3: 15) explains “…you came to Eve first only because women are easily enticed, and they know how to entice their husbands.” Interestingly, Be’er Yitzchok (ibid.) remarks, that Adam unlike his wife, ate even without being persuaded.
Another reason amply quoted by Meforshim (Hadeo VeHadibur p. 62 et. al.) is that Chava did not hear directly from Hashem the prohibition of not eating from from the tree, and therefore could be easily persuaded.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit”a