Question

Why is H2 more reactive than D2

Answer 1

Larger amount of energy is required to break bond of D2 as compared to H2 in simple eords Bond dissociation energy (BDE) of D2 is higher than H2 also D2 act more inertly than H2.

Answer 2

$H_2$ is more reactive than $D_2$ because of differences in their bond dissociation energy.

Explanation:

• The amount of energy required to break the bond present between atoms is called bond dissociation energy.
• Hydrogen has three isotopes namely protium (H), deuterium (D) and tritium (T).
• Among the three isotopes $H_2$ and $D_2$ are elements in which $H_2$ is composed of two hydrogen atoms whereas $D_2$ is composed of two Deuterium atoms.

• The bond dissociation energy for $H_2$ and $D_2$ are 435.90 and 443.40 respectively.

• As the bond dissociation energy value for $H_2$ is less when compared to $D_2$, it is considered as more reactive than $D_2$.

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