Page 284 - Theory and Problems of BEGINNING CHEMISTRY

CHAP. 18] ORGANIC CHEMISTRY 273

Solved Problems

INTRODUCTION
18.1. Name one type of reaction that practically all organic compounds undergo.
Ans. Combustion

BONDING IN ORGANIC COMPOUNDS
18.2. Write an electron dot diagram for C 2 H 5 Br.
Ans. H H
H C C Br
C
H H

18.3. What is the total bond order of sulfur in CH 3 SH?
Ans. 2

18.4. What is the total bond order of carbon in (a)CO 2 ,(b)CH 4 ,(c)H 2 C O, and (d) CO?
Ans. (a)4 (b)4 (c)4 (d)3

18.5. Draw electron dot diagrams for C 3 H 4 and C 3 H 8 .
Ans. H H H H
H C C C H H C C C H
H H H H

STRUCTURAL, CONDENSED, AND LINE FORMULAS
18.6. Draw electron dot diagrams and structural formulas for molecules with the following molecular formulas:
(a)CH 3 N and (b) HCN.
Ans. (a) H C N H H C N H (b) H C N H C N
H
H

18.7. Write the condensed formula for P(CH 3 ) 3 . What is the total bond order of phosphorus in this compound?
Ans. CH 3 P CH 3 The total bond order of P is 3

CH 3

18.8. Describe the difference, if any, between the compound(s) represented by the formulas CH 3 OH and
HOCH 3 .
Ans. There is no difference.

18.9. Write condensed formulas for (a)CH 3 CH 2 OCH 2 CH 3 and (b) (CH 3 CH 2 ) 2 NH.

Ans. (a)CH 3 CH 2 O CH 2 CH 3 (b)CH 3 CH 2 NH CH 2 CH 3

18.10. Explain the meaning in line formulas of a pair of parentheses with no subscript behind it, such as in
CH 3 CH 2 CH(CH 3 )C 3 H 7 .

Ans. The parentheses designate a branch, or side chain.