Which alkene on reductive ozonolysis will produce Acetaldehyde only ?

(1) Which alkyne on reductive ozonolysis will produce glyoxal only? (2) Which gas is produced on dehydrohalogenation of ethyl iodide?

But - 2 - yne on reductive ozonolysis produces

But - 2 - yne on reductive ozonolysis produces

Which alkene on reductive ozonolysis given acetone as the only product?

Which alkene upon reductive ozonolysis will give acetone as the product?

Which alkene upon reductive ozonolysis will give acetone as the product?

Which alkene upon reductive ozonolysis will give acetone as the product?

Which among the following alkenes on reductive ozonolysis produces only propanone ?