A short fragment of a polymer chain (two repeat units, end groups shown) is drawn. Select all correct statements.

AIn each C=C the two chain carbons lie on opposite sides
BThe polymer is natural rubber
CThis geometry occurs in gutta-percha and balata
DIt is more elastic than the cis isomer

Answer: A, C

Both double bonds are E, so the chain residues lie on opposite sides: this is trans-1,4-polyisoprene, the geometry of gutta-percha and balata. Natural rubber is the cis polymer, so B is wrong, and the straight trans chains pack tightly and are less elastic, so D is wrong.

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