Question

/2 4. List the following compounds in increasing order of boiling point: oct-1-yne b. 3-ethyl-2-methylbutene c. 5,5-dichloropent-1-yne d. hex-2-yne a. 5. List the following compounds in increasing order of density: /2 b. hex-2-yne c. 1,4-dibromopent-1-yne d.1,4-dichloropent-2-yne a. water

Answer 1

4) Let's see individuals boiling point of compound -

a) oct-1-yne

B. P= 126 ^{$\large \circ$}C at 760 mm of Hg

b) 3-ethyl-2-methylbutene

Actually IUPAC name of mentioned compound should be 2,3-dimethylpentane

B. P= 89.7 ^{$\large \circ$}C

c) 5,5-dichloropent-1-yne

B. P= 67-71^{$\large \circ$}C (range)

d) hex-2-yne

B. P= 85.4 ^{$\large \circ$}C at 760 mm of Hg

Boiling point increasing order = c $\large <$ d .$\large <$ b$\large <$ a

Here boiling point depends on functional group and nature of substituent .Intramolecular forces of attraction also contribute to higher boiling point of sample .

5)

Let's individuals density of compound -

a) Water

Density = 1.0g/cm³

b) Hex-2-yne

Density = 0.7 g/cm³

c) 1,4-dibromopent-1-yne

Density = 1.40g/cm³

d) 1,4-dibromopent-2-yne

Density =1.43 g/cm³

increasing order of density - b $\large <$ a$\large <$ c $\large <$ d