Fill in the blanks by choosing the appropriate word/words from those given in the brackets : (Natural, synthetic, step-growth, chain-growth, natural rubber, synthetic rubber, melamine, thermo, thermosetting, addition, condensation, hydrogen bonds, van der Waals', 373-573, 543, 100, 10, benzoyl peroxide, acetyl peroxide, amide, butadiene, natrium, dimethyl terephthalate)
Polymerization of ethene at .......... K temperature and ......... atomospheric pressure in presence of `O_2` forms polythene.

Explanation

373-573, 100