Substitution and addition reactions — task. Chemistry CBSE Live product, Class 10 (2026-27).

Identify the correct answer for the following:

1. What role do catalysts play in a reaction?

They slow down the reaction rate
They prevent the reaction from occurring
They react with the substrate to form a new product
They enhance the reaction rate without being consumed

2. What initiates the reaction between methane and chlorine gas?

Low temperature
Presence of sunlight
High pressure
Absence of light

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