Theme one CMY 128 Exam Complete Questions And Answers Graded A+.

When drawing a condensed structure of an organic compound, multiple bond lines are usually ______ while single bond lines are often ______. Multiple choice question. omitted, included included, omitted - correct answer included, omitted In the skeletal structure for an organic compound, it is assumed that there is a ............................, atom at the end of any line and at the junction of any two lines. This type of structure omits all ................, atoms except those directly bonded to a heteroatom. - correct answer Carbon Hydrogen Determine the number of hydrogen atoms attached to each of the marked C atoms in the structure shown. - correct answer a = 3 b = 1 c = 2 When interpreting skeletal structures of charged species, the number of lone pairs on a particular atom depends on the charge on that atom. Match each charge with the number of lone pairs present on the relevant atom. - correct answer no lone pairs = A carbon atom with a positive charge (and 3 bonds) one lone pair = A carbon atom with a negative charge (and 3 bonds) three lone pairs = An oxygen atom with a negative charge (and one bond) Both of the structures shown contain a charged carbon atom. In each case, indicate the number of hydrogen atoms attached to the charged carbon as well as the number of lone pairs it has. - correct answer Structure c = one H atom, no lone pairs Structure d = one H atom, one lone pair Which of the following statements correctly describe the conventions used when drawing condensed structures in organic chemistry? (Select all that apply.) Parentheses are used around similar groups that appear anywhere in the molecule Hydrogen atoms are omitted Lone pairs are omitted All bonds are drawn Atoms are drawn next to the atoms to which they are bonded - correct answer Lone pairs are omitted Atoms are drawn next to the atoms to which they are bonded Which of the following statements correctly describe the conventions used when drawing a skeletal structure for an organic compound? (Select all that apply.) All hydrogen atoms are included in the drawing. Parentheses are used for identical groups bonded to the same atom. All heteroatoms are drawn and the hydrogens directly bonded to them. The unlabeled end of a line represents a C atom. It is assumed that every carbon atom has enough hydrogens to make it tetravalent. - correct answer All heteroatoms are drawn and the hydrogens directly bonded to them. The unlabeled end of a line represents a C atom. It is assumed that every carbon atom has enough hydrogens to make it tetravalent. There are _____ hydrogen atom(s) attached to Ca, _____ hydrogen atom(s) attached to Cb, and _____ hydrogen atom(s) attached to Cc in the structure shown. 3; 1; 0 3; 0; 1 3; 1; 1 2; 0; 1 4; 0; 1 3; 0; 2 - correct answer 3; 0; 1 When interpreting skeletal structures of charged species, two general rules are useful. A charge on a carbon atom replaces _____ hydrogen atom(s), and the charge on any atom determines the number of covalent bonds and _____ electron pairs on that atom. 2; bonded 1; bonded 1; nonbonded 0; nonbonded 0; bonded 2; nonbonded - correct answer 1; unbonded The charged oxygen atom in the structure shown has .............., lone pairs of electrons, which have not been included. - correct answer 3 Which of the following statements correctly defines hybrid orbitals? Orbitals that are used to form different types of bonds Orbitals formed by "mixing" atomic orbitals from two different atoms in a certain combination Orbitals formed by the overlap of two orbitals from two different atoms Orbitals used for bonding that are formed by "mixing" atomic orbitals from the same atom - correct answer Orbitals used for bonding that are formed by "mixing" atomic orbitals from the same atom Which of the following statements correctly describe hybrid orbitals? (Select all that apply.) Several atomic orbitals can be c