A level Chemistry - year 2 aromatics question

Hi there, I cant find an explanation for this and was wondering if anyone could help?
Why when converting an NO2 group attached to benzene to a NH2 group, do you need 6[H]'s and what exactly is a [H]?
Thanks ,Daniel

Reply 1

sogieva

6

Hi Daniel,

To my knowledge the [H] represents the reducing agent that turns nitrobenzene into aniline. This is usually Sn and HCl.
When nitrobenzene is reduced it produces aniline and water. Therefore to balance the equation you are correct, 6 hydrogens are needed on the left hand side and 2 waters on the right.

Reply 2

isa04

17

Original post by danhas20

Hi there, I cant find an explanation for this and was wondering if anyone could help?
Why when converting an NO2 group attached to benzene to a NH2 group, do you need 6[H]'s and what exactly is a [H]?
Thanks ,Daniel

the 4(H ) will react with the oxygen to make Water (H2o) and the other 2 will be part of the nh2 group

Reply 3

isa04

17

remember benzene makes a molecule more stable due to the delocalised electron cloud
https://chemrevise.files.wordpress.com/2023/02/3.10-revision-guide-arene-chemistry-aqa.pdf

(edited 1 year ago)

Reply 4

danhas20

OP

13

Original post by sogieva

Hi Daniel,

To my knowledge the [H] represents the reducing agent that turns nitrobenzene into aniline. This is usually Sn and HCl.
When nitrobenzene is reduced it produces aniline and water. Therefore to balance the equation you are correct, 6 hydrogens are needed on the left hand side and 2 waters on the right.

Thanks for getting back to me but I just realised I misworded my question, it was supposed to be 'why do you need 6[H]?'
I can sort of see where you're coming from but if you don't mind, could you go into a little more detail?
Thanks

Reply 5

danhas20

OP

13

Original post by isa04

the 4(H ) will react with the oxygen to make Water (H2o) and the other 2 will be part of the nh2 group