Question

Assertion (A) :combustion of all organic compounds is an exothermic reaction.
Reason (R) :the enthalpy of all elements in their standard state are zero.
1)both A and R are true and R is the correct Explanation of A.
2)both A and R are true but R is not the correct explanation of A.
3)A is true but R is false.
4)A is false but R is true.​

Answer 1

2)both A and R are true but R is not the correct explanation of A.

Explanation:

Combustion of organic compounds is always exothermic. Heat or enthalpy of formation of natural elements in their standard state is considered to be zero.

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