The mechanism of  reaction is given as :A student writes general characteristics based on the given mechanism as :a) The reaction is favoured byweak nucleophilesb) R+ would be easily formed if the substituents are bulkyc) The reaction is accompained by recemization.d) The reaction is favoured by non-polar solvents.Which observations are correct?

Given reaction is SN1 *SN1 reaction is independent of strength of nucleophiles. Generally strong nucleophiles favoured the SN2 but in SN1 weak nucleophiles are favored Order of stability of Alkyl carbocations  R⊕is 3º>2º>1º.  Bulky carbocation (3º) more stable and forms easily increase the bulkyness of carbocation increase the stability of carbocation. In SN1 both inversion and retension can takes place in equal ratio gives the Racemic mixture if R-X is optically active.SN1 is favourable in polar solvent due to salvation of carbocation increase the stability of carbocation.