1.The reaction of propone with HOCl (Cl2 + H2O) proceeds through the intermediate. A) CH3−CH−CH2−Cl B) CH3−CH(OH)−CH2 C) CH3−CHCl−CH2 D) CH3−CH−CH2−OH View Answer Report DiscussAnswer: Option AExplanation:
2.In the Hofmann-bromamide degradation reaction, the number of moles of NaOH and Br2 used Per mole of amine produce are A) 4 moles of NaOH and 2 moles of Br2 B) 2 moles of NaOH and 2 moles of Br2 C) 4 moles of NaOH and 1 mole of Br2 D) 1 mole of NaOH and 1 mole of Br2 View Answer Report DiscussAnswer: Option CExplanation:Hofmann-bromamide degradation reaction is given as: RCONH2 + 4NaOH + Br2 → RNH2 + Na2CO3 + 2NaBr + 2H2O Hence, four moles of NaOH and one mole of are used.
3.The reaction of zinc with dilute and concentrated nitric acid, respectively, produce A) NO2 and NO B) NO and N2O C) NO2 and N2O D) N2O and NO2 View Answer Report DiscussAnswer: Option DExplanation:Zn + 4HNO3(conc)→ Zn(NO3)2 + 2H2O + 2NO2 4Zn + 10HNO3→ 4Zn(NO3)2 +N2O + 5H2O
4.Which of the following atoms has the highest first ionization energy? A) Na B) K C) Sc D) Rb View Answer Report DiscussAnswer: Option CExplanation:Order of first ionization energy is Sc > Na>K>Rb. Due to poor shielding effect, removal of one electron from 4s orbital is difficult as compared to 3s-orbital.
5.Which one of the following complexes shows optical isomerism? A) cis[Co(en)2Cl2]Cl B) trans[Co(en)2Cl2]Cl C) [Co(NH3)4Cl2]Cl D) [Co(NH3)3Cl3] View Answer Report DiscussAnswer: Option AExplanation: [Co(NH3)4Cl2]Cl can exist both in cis and trans forms that are given below [Co(NH3)3Cl3] exists in fac and mer-isomeric forms and both are optically inactive.
