What functional group resembles a hydroxyl group?

Answer 1
You may be asking about sulfhydryl groups (#-"SH"#), which resemble a hydroxyl group (#-"OH"#), so compounds that only contain #-"SH"# as a unique functional group are named based off of the original alcohol.

NOTE: Since ethanol is a complete, defined compound, it cannot be a functional group. Entire compounds are not functional groups.

However, #-"OH"# is a molecular fragment and is called a functional group.
Normally alcohols have IUPAC names ending in "-ol", and have prefixes based off of the original alkane (e.g. #\mathbf("Ethan")"ol"#).
#"CH"_3"CH"_2"SH"#, or ethanethiol, is the sulfur analog of #"CH"_3"CH"_2"OH"# (ethanol). Ethanethiol is a thiol, while ethanol is a regular alcohol.

If an alcohol exists, then naming the sulfur analog of the alcohol is as easy as adding "thi" before "-ol" and using the full name of the potential alkane rather than skipping the vowel before the suffix.

#"Ethan"\mathbf("ol")# #-># #"Ethan"\mathbf("ethiol")#
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Answer 2

The functional group that resembles a hydroxyl group is the thiol group (-SH).

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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