The reactions of higher order are rare because :

many body collisions involve very high activation energy

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many body collisions have a very low probability

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many body collisions are not energetically favoured.

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many body collisions can take place only in the gaseous phase

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Solution

The correct option is B many body collisions have a very low probability
The reactions of higher order are rare because many body collisions have a very low probability. The chances of three or more molecules colliding at the same time to give product are very low.

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The reactions of higher order are rare because :

The correct option is B many body collisions have a very low probabilityThe reactions of higher order are rare because many body collisions have a very low probability. The chances of three or more molecules colliding at the same time to give product are very low.

The correct option is B many body collisions have a very low probability
The reactions of higher order are rare because many body collisions have a very low probability. The chances of three or more molecules colliding at the same time to give product are very low.