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Question:

Write the structure of p-methylbenzaldehyde molecule.

Solution:

p-methylbenzaldehyde, also known as p-tolualdehyde, has a benzene ring with a methyl group (-CH3) and an aldehyde group (-CHO) as substituents. The 'p-' prefix indicates that these substituents are para to each other, meaning they are positioned opposite each other on the benzene ring.

The structure can be represented as follows:

     CHO
     |
  CH3-C6H4

Alternatively, a more detailed structural formula can be shown:

      CHO
      | 
     / \ 
    /   \ 
   /     \
  6       2
 /\       /\
5   1   -C-   3
 \/       \/
    4       CH3

Where the numbers indicate the positions of the atoms on the benzene ring.