Question

dichlorination of pentane gives x structural isomers. the value of 5x/2 is

Answer 1

Answer:

To have a single mono-chloride , there should be only one type of H−atom. This is because, replacement of any H−atom leads to the formation of same product.

∴ The isomer C

5

H

12

that leads to a single mono-chloride is neo-pentane.

CH

3

−

CH

3

∣

C

∣

CH

3

−CH

3

ii) To have 3 isomeric mono-chlorides, the isomer should contain 3 different types of H−atoms.

∴ The isomer should be n−pentane.

CH

3

c

−

CH

2

b

−

CH

2

a

−

CH

2

b

−

CH

3

c

iii) To have 4 isomeric mono-chlorides, the isomer should contain 4 different types of H−atoms.

∴ The isomer is 2−methylbutane.