Question

Which of the following will give a positive Tollens test? ($12.4$)

a.$1-propanol$

b.$2-propanol$

c. hexanal

Short answer

(a) The $1-propanol$will not give a positive Tollens test.

(b) The $2-propanol$will not give a positive Tollens test.

(c) The hexanal will give a positive Tollens test.

Step-by-step solution

Part (a) Step 1 : Given information 

We need to find that whether the $1-propanol$will give tollens test or not

Part (a) Step 2: Explanation

We know that

Tollens test is given by aldehydes.

And as the given compound is alcohol

Therefore,

The given compound will not give Tollens test.

Part (b) Step 1 : Given information 

We need to find that whether the $2-propanol$will give tollens test or not

Part (b) Step 2: Explanation 

We know that

Tollens test is given by aldehydes.

And as the given compound is alcohol

Therefore,

The given compound will not give Tollens test.

Part (c) Step 1 : Given information  

We need to find that whether the hexanal will give tollens test or not

Part (c) Step 2: Explanation 

We know that

Tollens test is given by aldehydes.

And as the given compound is an aldehyde

Therefore,

The given compound will give Tollens test.