What is the expected product when acetaldehyde and hydrogen react in the presence of platinum

formation of alcohol or primary alcohol occur in this reaction. Reduction occurs when acetaldehyde react with hydrogen that is addition of hydrogen occur in acetaldehyde compound, the double bond between oxygen and carbon breaks down and addition of hydrogen with oxygen occur forming hydroxyl and also addition of hydrogen occur at carbon results in formation of alcohol.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?