Answer

  1. Reaction 2

Explanation:

Since given reaction is SN2​ and we know that SN2​ favoured in presence of polar aprotic solvent like crown-ethers, DMSO, DMF, etc not H2​O which is polar protic solvent.

In reaction 2 polar solvent (crown ether) is used.

Thus reaction 2 is faster than reaction 1.

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