SINDH MDCAT 2019 CHEMISTRY#Atomic Structure#Canal Rays1146Choose the best answerThe nature of positive rays depends on: (Sindh MDCAT 2019)AThe nature of the electrodeBThe nature of the discharge tubeCThe nature of the residual gasDThe shape of the electrode Like 0 Discuss 0Share
LiquidsBoiling Points of Group 15 Hydrides1147Choose the best answerWhich Group 15 hydride has the highest boiling point?ANH₃BPH₃CAsH₃DSbH₃ Like 0 Discuss 0Share
Periodic TableElectronegativity1148Choose the best answerWhich quantitative periodic property is expressed without a unit?AElectronegativityBElectron gain enthalpyCIonization enthalpyDAtomic radius Like 0 Discuss 0Share
Alkyl HalidesSN1 and SN2 Reactions1149Choose the best answerWhich phenomenon is characteristic of SN₁ but not SN₂ reactions?ANucleophilic substitutionBFormation of a transition stateCCarbocation rearrangementDBond formation Like 0 Discuss 0Share
Alkyl HalidesE1 and E2 Reactions1150Choose the best answerA secondary alkyl halide can undergo either E1 or E2 depending mainly on:AWhether carbon is presentBReaction conditions such as base strength, solvent and temperatureCFormation of an aromatic ringDPresence of oxygen in the substrate Like 0 Discuss 0Share