# What is the other name of the monomer of natural rubber?

$\begin{array}{1 1}(a)\;\text{2-Methyl buta-1,3-diene}\\(b)\; \text{2-Methyl buta-1-ene}\\(c)\;\text{Diethyl buta-1,3-diene}\\(d)\;\text{2-Methyl buta-3-ene}\end{array}$

Natural rubber is a polymer of isoprene(2-Methyl buta-1,3-diene)
In natural rubber about 11000-20000 isoprene units are linked together in a chain like arrangement.
Hence (a) is the correct answer.