JEE Main · ChemistryEasy

$The monomer unit of natural rubber is:$

A. $CH_{2} = C (CH_{3}) - CH = CH_{2}$
B. $CH_{2} = CH - CH = CH_{2}$
C. $CH_{2} = C (Cl) - CH = CH_{2}$
D. $C_{6} H_{5} CH = CH_{2}$

Show correct answer & step-by-step solution

Correct answer: A — $CH_{2} = C (CH_{3}) - CH = CH_{2}$

Solution

$Natural rubber is a cis-1,4-polyisoprene.$
$The monomer of polyisoprene is isoprene.$
$The IUPAC name for isoprene is 2-methyl-1,3-butadiene.$
$Hence the answer is (A).$

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