Alkyl HalidesStereochemistry of SN1 Reaction41Choose the best answerAn SN₁ reaction at a chiral centre usually gives:AComplete retention onlyBPartial racemization, often with more inversion than retentionCComplete retention of configurationDComplete inversion only Like 0 Discuss 0Share
Alkyl HalidesLeaving Group Ability42Choose the best answerWhy does C₂H₅I undergo nucleophilic substitution faster than C₂H₅Br under similar conditions?AI⁻ is the attacking nucleophile.BI⁻ is more strongly hydrated.CThe C–I bond is more polar than every C–Br bond.DThe C–I bond is weaker than the C–Br bond. Like 0 Discuss 0Share
Alkyl HalidesStructure and Reactivity of Grignard Reagents43Choose the best answerThe carbon atom bonded to magnesium in a Grignard reagent behaves as:AElectrophilic carbonBNucleophilic carbonCNeutral carbonDPositively charged carbon Like 0 Discuss 0Share
Alkyl HalidesSN1 and SN2 Reactions44Choose the best answerWhich feature is common to both SN₁ and SN₂ reactions?ANucleophilic substitutionBCarbocation formationCCarbocation rearrangementDFirst-order kinetics Like 0 Discuss 0Share
Alkyl HalidesSolvent Effect on SN1 Reaction45Choose the best answerA polar protic solvent favors SN₁ mainly because it:AConverts every nucleophile into a stronger base.BStabilizes the carbocation and leaving-group ions.CPrevents substrate ionization.DIncreases steric hindrance. Like 0 Discuss 0Share