Hey, So I get the basic idea of this and can do most of the problems, but someti

Question

Hey, So I get the basic idea of this and can do most of the problems, but sometimes I come unstuck. So just looking for some clarification.

The [H] inside the square, may sound like a dumb question but do they represent hydrogens?

What does the AR stand for?

I am also confused about the line notation, for example, the double bonded O at about 2.8 does this molecule have only 2 carbons on it? or are they carbons on the end of lines to? or are they parts to connect things to?

Am I also correct in assuming that the R is any r chain?

Please be as detailed as possible. THANKS in advance!

Characteristic H Chemical Shifts (NB. all values are approximate!) Downfield, de shielded Upfield, shielded 0 CHC Note: O-H may come at a variety of places O A, 0 11 10 5 0 ppm

Explanation / Answer

Ar stands for aromatic ring

R is an any alkane chain

=O at 2.8 doesnt mean only 2 carbon atoms only

left side it may be more C atoms. but peak represents =O adjecent C attached hydrogens only.

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