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JEE Main levelSingle correct optionDifficulty 2 of 3pl198

Which of the following pairs of conditions and polymer is correct?

A $Al (C X_{2} H X_{5}) X_{3}$ + $TiCl X_{4}$ , 333-343 K, 6-7 atm: low density polyethene
B $Al (C X_{2} H X_{5}) X_{3}$ + $TiCl X_{4}$ , 333-343 K, 6-7 atm: high density polyethene
C $NaNH X_{2}$ in liquid ammonia, 1000 atm: low density polyethene
DTrace of dioxygen or a peroxide, 350-570 K, 1000-2000 atm: high density polyethene

Answer: B

HDPE (linear chains) is made with a Ziegler-Natta catalyst at low temperature and pressure. LDPE (branched chains) is made by a free radical route (traces of

O X_{2}

or peroxide) at high temperature and 1000-2000 atm.

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