CH-1010 Midterm: CH 1010 Exam1.Fall2015.Key

Br- 6. Name the following compound: 7. What is the index of hydrogen deficiency (or degree of unsaturation) of benzene (ceHe)? a) 2 b) 3 c) 4 d) 5 e) 6 8. Which compound would show optical activity? A) cis-1,4- Dimethylcyclohexane B) trans-1,4- D methylcyclohexane C) cis-1,4- Dimethylcycloheptane D) trans-1,4- Dimethylcycloheptane E) More than one of these choices. 9. For the generalized structure BrCH2CHCICH2CHCICH2Br there exists what number of stereoisomers? A) 2 B) 3 C) 4 D) 6 E) 8 10. The structures CH CH3 CH3 CH H represent A) a single compound. B) enantiomers.

Consider the following molecule for question 1-1: SO 1. How many tetal valence electrons for this molecule? A) 28 B) 30 C) 32 D) 38 E) None of these 2. How many bonds to the central atom? (double bonds 2; triple bonds 3) )4 B)5 C)6 D) 7 3. How many lone electron pairs around the central atom? A)0 B)1 C)2 D)3 E)4 4. How many total lone electron pairs in the molecule? A) 8 B) 9 C) 10 D) 11 E) 12 5. What is its molecular geometry? A) tetrahedral B) octahedral C) trigonal pyramidal D) seesaw E) trigonal bipyramidal 6. What is the hydridization on the central atom? A) sp B) sp C) sp D) sp'd E) sp'd 7. What is the formal charge on the central atom? A)-2 B)-1 C) 0 E) 2

Question 1 How many secondary carbons are p in the alkane shown resent a. 1 O b.2 O c. 3 O d 4 e.5 Question 2 Which structural formula is the most stable? CH a. 1 O b.2 O c. 3 O d 4 O e.5 CH CH CH CH CH CH CH CH CH CH CH CH CH 5 CH