Answer : The largest partial negative charge occurs on Oxygen.
Explanation :
The given molecule is, [tex]CH_3CHO[/tex]
This molecule contains 4 hydrogen atom which are singly-bonded with carbon atom and 1 oxygen atom which is doubly-bonded with carbon atom and 1 carbon-carbon bond.
As, oxygen is more electronegative than the carbon and hydrogen. So, oxygen pulls electrons more than the carbon and hydrogen. Due to which the oxygen gains partial negative charge and carbon and hydrogen gains partial positive charge.
The structure is shown below.
