Question

how can we distinguish wether it's SN 1 or SN 2 ?

Answer 1

we can distinguish it . just check the functional group attached with carbon is 1° , 2° or 3° .
for sn1 order of reactivity is 3°>2°>1°
for sn2 order of reactivity is 1°>2°>3°

so in this question you're correct answer would be d)

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