1-butanol reaction mechanism?

please select one which mechanism the subsitution of 1-butanol follows:

1)Sn1
2)Sn2
3)mainly Sn1
4)mainly Sn2
5)Sn1 with significant Sn2
6)Sn2 with significant Sn1

anyone has any idea?thank you.=)

Answer:
It should be an SN2 reaction for two reasons: 1. the hydroxyl group on the 1-butanol is not hindered and 2. If it underwent an SN1 reaction it would have a primary carbocation intermediate. Primary carbocations are not stable. Hope this helps.
Substitution of what with 1-butanol?

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