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I know what R groups mean.

But what is meant by R-H?

I did a bit of googling but couldn't find any satisfying answers.

If there's any problem in my question please inform me.

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    $\begingroup$ R-H is just what it says: some R connected to H. $\endgroup$ Apr 19 '18 at 14:00
  • $\begingroup$ I'm pretty sure it's just a hydrogen bonded to an R group. $\endgroup$
    – Frank
    Apr 19 '18 at 14:00
  • $\begingroup$ @Frank Can R-H indicate a Methyl group $\endgroup$
    – trying
    Apr 19 '18 at 14:01
  • $\begingroup$ The R can be a methyl group $\endgroup$ Apr 19 '18 at 14:04
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    $\begingroup$ The "R" in R-H comes from the German Reste, the remainder or residue. It's use goes back at least to Auguste Laurent in the 1840's....perhaps earlier. $\endgroup$
    – user55119
    Apr 19 '18 at 15:57
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An R group is a term used in organic chemistry as a shorthand for functional groups. An R-H means that your functional group is attached to a hydrogen. For example a CH3-H.

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  • $\begingroup$ Why the downvote? $\endgroup$ Apr 19 '18 at 15:35
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    $\begingroup$ Answers to homework questions aren't encouraged. I didn't downvote. $\endgroup$ Apr 19 '18 at 15:43
  • $\begingroup$ I totally understand. Thank you, i'll know for next time $\endgroup$ Apr 19 '18 at 16:00

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