Question

Question #d16c7

Answer 1

It depends on the particular isomer, but the expected answer is probably (d) both b and c.

Explanation:

Alkenes and alkynes can decolourize bromine water.

(a)

Possible structures are `"CH"_3"CH"_2"CH"_2"COOH"` and `("CH"_3)_2"CHCOOH"`.

There are no `"C=C"` or `"C≡C"` bonds, so neither of these isomers will decolourize bromine water.

(b)

Two possible structures are `"CH"_3"CH"_2"CH=CH"_2` and `"CH"_3"CH=CHCH"_3`. Both of these will decolourize bromine water.

A third possibility is cyclobutane. It will not decolourize bromine water.

(c)

There are many possible structures.

• `"CH"_3"CH=CHCH=CH"_2`and various diene isomers
• `"CH"_3"CH"_2"CH"_2"C≡CH"` and various alkyne isomers
• Cyclopentene
• Methylcyclobutene and cyclopropene isomers.

All of these will decolourize bromine water.

But bicyclo[2.1.0]pentane does not decolourize bromine water.