Question

In the following elimination reaction of alkyl halide, it is likely to be [Endothermic or Exothermic] and have a [positive entropy change or negative entropy change]

alkyl halide -> alkene + HX

Answer 1

Endothermic - when heat is involved or absorbed in the reaction.

Exothermic- when heat is released in the reaction.

Elimination requires energy, so elimination of alkyl halide to alkene is an Endothermic reaction.

Alkyl halide ------heat---> alkene + HX .

Entropy = randomness in the system or lack of orderness . More will be the molecules more will be the entropy of system.

As 1 molecule of reactant is forming 2 product molecules (1 alkene and 1 HX ) , so the entropy of the system increased.

And hence there is positive entropy change .