40. Which of the following is not a structural isomer of 1-pentene?
(A) 2-pentene
(B) 2-methyl-2-butene
(C) cyclopentane
(D) 3-methyl-1-butene
(E) 1-methyl- cyclobutene

36. The unit cell in a certain lattice consists of a cube formed by an anion at each corner, an anion in the center, and a cation at the center of each face. The unit cell contains a net (A) 5 anions and 6 cations (B) 5 anions and 3 cations (C) 2 anions and 3 cations (D) 3 anions and 4 cations (E) 2 anions and 2 cations

37. How many unpaired electrons are there in ? (A) 4 (B) 3 (C) 2 (D) 1 (E) 0

38. Which of the following statements is true of the crystal field model? (A) the interaction between metal ion and ligand is treated as a Lewis acid-base interaction (B) the ligands are treated as negative point charges (C) the metal ion-ligand bonds are considered completely ionic (D) the electrons are assumed to be localized (E) none of these statements is true

39. Which of the following statements about the complex ion is true? (A) the complex ion contains Co(I) (B) The complex ion exhibits cis and trans geometric isomers, but no optical isomers (C) the complex ion exhibits two geometric isomers (cis and trans) and two optical isomers (D) because en is a strong field ligand, the complex ion is paramagnetic (E) the geometric isomers of the complex ion have identical chemical properties

41. Consider the molecule trans-2-butene. Which statement is true? (A) the molecule has two π bonds (B) there is free rotation around every bond in the molecule (C) cis-2-butene is its structural isomer (D) carbon #2 exhibits sp² hybridization (E) none of these

42. Aspirin is formed via a(n) _ reaction. (A) combustion (B) hydrogenation (C) addition (D) condensation (E) substitution

43. The alpha helix of a protein is held in a coiled conformation partly because of (A) hydrogen bonding (B) optical activity (C) active sites (D) double bonding (E) none

44. The isotactic, syndiotactic, and atactic forms of polypropylene differ in (A) the functional groups they contain around the carbon backbone (B) the terminating functional groups they contain (C) the positions of the methyl groups around the carbon backbone (D) the number of methyl groups around the carbon backbone (E) both C and D

45. Choose the correct molecular structure for XeF6. (A) trigonal bipyramidal (B) trigonal planar (C) tetrahedral (D) octahedral (E) none of these

46. Phosphorus is found in nature as (A) white phosphorus (B) red phosphorus (C) black phosphorus (D) usually as the ion in phosphate rock (E) in gypsum