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B
Hydrochloride rubber
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C
Buna-N
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D
Synthetic rubber
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Solution
The correct option is A Gutta-percha Polyisoprene is a collective name for polymers that are produced by polymerization of isoprene. Isomer cis-1,4-polyisoprene is a major ingredient of natural rubber whereas trans-1,4-polyisoprene is a major ingredient of gutta-percha,
Hence, option (a) is correct.