The significant property of CPVC, which differs it from PVC is -

Correct option is A

CPVC (Chlorinated Polyvinyl Chloride) differs from PVC (Polyvinyl Chloride) primarily in its improved heat resistance. CPVC can withstand higher temperatures compared to standard PVC, which makes it suitable for hot water applications and more resilient under heat.
 Improved heat resistance: Correct, as CPVC has better thermal stability than PVC.
 Higher scrap value: Not a significant distinguishing property.
 Heavy weight: Not necessarily a key difference between CPVC and PVC.
 Decreased heat resistance: Incorrect, as CPVC actually has increased heat resistance.
Therefore, the correct answer is (a) Improved heat resistance.