Observe the following reactions.

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Which of the following reaction does not involve inversion of configuration.
Reaction -1 → SN2 inversion
Reaction -2 → SN1 racemerisation
Reaction -3 → SN1 retention
Reaction -4 → SN2 inversion
Reaction -5 → SN1 racemerisation
Reaction -6 → SN NGP
Which of the following reaction will give more than one organic product .
