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The mechanism of SN1 reaction is given a...

The mechanism of SN1 reaction is given as :
`underset("pair")underset("Solvent Separated ion")(underset("lon pair")(R-X-R^(o+)X^(Theta)rarrR^(o+))"||"X^(Theta)overset(Y^(Theta))rarrR-Y+X^(Theta))`
A student writes general characteristics based on the given mechanism as :
(a) The reaction is favoured by weak nucleophiles.
(b) `R^(o+)` would be easily formed if the substituents are bulky.
(c) The reaction is accompanied by racemization.
Which observations are correct?

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