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JEE Main levelSingle correct optionDifficulty 2 of 3pl215

Two growing polystyryl radicals with 300 and 500 styrene units respectively (ignore initiator fragments) terminate by combination. The number of styrene units in the single dead polymer chain formed is

A400
B800
C500
D300

Answer: B

Termination by combination joins the two radical ends by a new

C - C

bond, giving one dead chain whose length is the sum:

300 + 500 = 800

units. Disproportionation, in contrast, would leave two dead chains of 300 and 500 units.

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