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I have read that the word Vinyl and Acryl, both refer to the same group.

The difference is that Acryl is used for naming when the functional group attached itself contains a carbon atom while Vinyl is used in the other case.

Then why is the name of the following compound:

enter image description here

Vinyl Acetate and not Acryl Acetate?

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closed as off-topic by Mithoron, A.K., Todd Minehardt, Nuclear Chemist, aventurin Oct 14 '18 at 11:50

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    $\begingroup$ Vinyl is CH2=CH- while acryl is CH2=CH-C. So, vinyl acetate is correct; acryl acetate is not. CH2=CHCN is acrylonitrile (a nitrile is a triple-bonded nitrogen) or, in principle, vinyl cyanide. I heard a story that a chemical company tried to ship a tank car of vinyl cyanide but it was prohibited because "cyanides are toxic". It shipped without difficulty as acrylonitrile. See also, acrylic acid, acrylamide and methyl acrylate. $\endgroup$ – user55119 Oct 13 '18 at 15:40
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    $\begingroup$ I saw your answer just after I commented. The point is there are no hydrogens on the bare carbon otherwise we would be using the term "allyl". All of our examples have no hydrogens on the bare carbon. $\endgroup$ – user55119 Oct 13 '18 at 15:52
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Your question is mistaken, vinyl and “acryl” are not the same (and the latter standalone name even does not mean anything in IUPAC nomenclature, it's like “acet” in ‘acetyl‘/‘acetic’). See the following structures (preferred IUPAC names/prefixes are in boldface).

$\ce{CH2=CH\bond{-}}$
vinyl
ethenyl

$\ce{CH2=CH-COOH}$
prop-2-enoic acid
acrylic acid

$\ce{CH2=CH-CO\bond{-}}$
acryloyl
prop-2-enoyl
1-oxoprop-2-en-1-yl

$\ce{CH2=CH-CO-NH2}$
acrylamide
prop-2-enamide

$\ce{CH2=CH-CO-O-CH=CH2}$
vinyl acrylate
ethenyl prop-2-enoate

(But now I understand that one might somehow deduce from some structures that the vinyl component is named acryl.. and there even might be some historic reasons, which I'm currently not aware of.)

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