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chemistry

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1. All of the following are structural isomers of CH2=CHCH2CH=CHCH3 EXCEPT
a. CH2=CHCH2CH2CH=CH2
b. CH3CH=CHCH2CH=CH2
c. CH3CH=CHCH=CHCH3
d. CH2=C=CHCH2CH2CH3
Is it D?

2. Almost all of the amoino acids found in living organisms are in the L-form. L-Alanine and D-alanine are
a. structural isomers
b. geometric isomers
c. optical isomers
d. stereoisotopes
Is it C?

Thanks for helping out!

  • chemistry -

    Isn't b just written the reverse of the original molecule? That makes it the same compound, not a different isomer.I think optical isomers is correct.

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