Please help me answer the following multiple choice questions. I NEED to get the

Question

Please help me answer the following multiple choice questions. I NEED to get them right. Thank you!

1 pts Question3 Below are two structures known to be acidic at the sites indicated by a dashed arrow. Which of the two is the more acidic, and why? NH2 2 CH3 CH3 A, because nitrogen is more electronegative and thus better able to stabilize electron density in the conjugate base. O O B, because phosphorus is larger and thus better able to stabilize electron density in the conjugate base. O A, because nitrogen is smaller and thus better able to stabilize electron density in the conjugate base. O B, because phosphorus is less electronegative and thus better able to stabilize electron density in the conjugate base.

Explanation / Answer

3) A option is correct

Reason : Acid strength

1)The most important factor in the strength of acid is the stability of the conjugate base- the more stable the conjugate base , the stronger the acid.

2) An important factor in the stability of conjugate base is which element the negative charge is on- the more electronegative the element , the more stable the conjugate base.

4) the relationship between Keq , which in this case called the acid dissociation Ka and pKa is the following.

pKa = -log Ka

Ka = 10-pKa

therefore pKa = -log Ka

=-log(106.5)

=-6.5

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