October 16, 2021, 04:49:49 AM
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Topic: Reason for RSH > ROH in terms of acidity  (Read 1247 times)

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Offline Quexkeh

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Reason for RSH > ROH in terms of acidity
« on: August 12, 2021, 11:28:50 PM »
Comparing the acidity of RSH and ROH, RSH is more acidic. The reasons are that
1. S-H bond is weaker than O-H bond
2. Negative charge on RS- conjugate base can spread out to a larger surface area on S than on O, decreasing the charge density on S than O

What I said was
O > S in terms of electronegativity. Since in both compounds. Since the R group is the same(no change in electrodonating effecf), O would intensify the negative charge on RO- conjugate base more than S on RS-. Thus RSH is more acidic.

This was not accepted because "O or S electron withdrawing effect cannot be considered as it is the group in question"

Why can't I consider its electron withdrawing effect? I do not get it.

Offline rolnor

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Re: Reason for RSH > ROH in terms of acidity
« Reply #1 on: August 13, 2021, 12:51:01 AM »
Why would O intensify the negative charge in RO-? What does electronegative mean?

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