SOLVED

51) Classify the following polymers as atactic, isotactic or syndiotactic: A) Polymer A is isotactic, polymer B is atactic and polymer C is syndiotactic B) Polymer A is atactic, polymer B is isotactic and polymer C is syndiotactic C) Polymers A and B are isotactic and polymer C is syndiotactic D) Polymer A is isotactic and polymers B and C is syndiotactic E) Polymer A is syndiotactic, polymer B is isotactic and polymer C is atactic 52) Which type of polymerization and which monomer(s) would you use to prepare poly(1,4-phenylenediformamide) with the following structure? A) with chain reaction polymerization B) with condensation polymerization C) with chain reaction polymerization D) with step-reaction polymerization E) with chain reaction polymerization 53) Suggest possible compounds for A and B in the following scheme: CH3CH2I + A → CH3CH2SH + B A) A is HS- and B is I- B) A is H2S and B is I2 C) A is H2S and B is HI D) A is S2- and B is I- E) A is H2S and B is I- 54) Suggest possible compounds for A, B and C in the following scheme: A) A is Cl2, B is AlCl3 and C is meta chloronitrobenzene B) A is Cl2, B is FeCl3 and C is ortho chloronitrobenzene C) A is Cl2, B is FeBr3 and C is meta chloronitrobenzene D) A is HCl, B is AlCl3 and C is para chloronitrobenzene E) A is Cl2, B is AlBr3 and C is meta chloronitrobenzene 55) What is “retrosynthesis”? A) a chemical analysis followed by chemical synthesis B) a chemical synthesis followed by chemical analysis C) a synthetic procedure designed to check old synthetic procedure D) a synthetic strategy that works from the desired compound towards starting materials E) a synthetic strategy that works from the starting materials towards desired product 56) Which of the following are nucleophiles? I. CH3C(O)CH3 II.  CH3BrIII.  CH3CH2C≡C- A) I B) II C) III D) I + II E) I + III 57) Which of the following are electrophiles? I.  CH3CH2NH2II. CH3CH2I III.  CH3OH  A) I B) II C) III D) I + II E) I + III 58) What is the rate law for the SN1 reactions (S is substrate and N is nucleophile) ? A) rate = k[S][N] B) rate = k[S] C) rate = k[N} D) rate = k[S]2 E) rate = k[S][N}2 59) Predict the product and mechanism type for the following reaction: A) B) C) D) E) 60) Identify the product(s) and mechanism for the following reaction: A) B) C) D) E)