Advices For Studying Organic Chemistry

2) The lower number of the two carbon atoms of the triple bond is used to

designate the location of the triple bond.

3) Where there is a choice the double bond is given the lower number.

H CCH CH^3 CH^2 C CCH^3 H C CCH^2 CH CH^2
Ethyne or acetylene 2-Pentyne 1-Penten-4-yne

32 1

ClH 2 CC CH

4321

H 3 CC CCH 2 Cl HC CCH 2 CH 2 OH

4 32 1

3-Chloropropyne 1-Chloro-2-butyne 3-Butyn-1-ol

CH 3 CHCH 2 CH 2 C CH

CH 3

654321

CH 3 CCH 2 CCH

CH 3

CH 3

5 4 321

CH 3 CCH 2 C CH

OH

CH 3

1 2 3 4 5

5-Methyl-1-hexyne 4,4-Dimethyl-1-pentyne 2-Methyl-4-pentyn-2-ol

2. Terminal alkynes:

R CCH

A terminal alkyne

Acetylenic dydrogen

1) Alkynide ion (acetylide ion):

R CC

−

CH^3 CC

−

An alkynide ion (an acetylide ion) The propynide ion

4.7 PHYSICAL PROPERTIES OF ALKANES AND CYCLOALKANES

1. A series of compounds, where each member differs from the next member by a
   constant unit, is called a homologous series. Members of a homologous series
   are called homologs.

1. At room temperature (rt, 25 °C) and 1 atm pressure, the C 1 -C 4 unbranched