A carbonyl compound A(C₄H₈O), which undergoes haloform reaction gives compound B on reduction. B on heating with sulphuric acid gives a compound C which forms a mono-ozonide D. D on hydrolysis in present of zinc dust gives only acetaldehyde E. 

What is the name of the compound A?

Butan-2-one

The correct answer is option 1. Butan-2-one

Since carbonyl compound A(C₄H₈O) undergoes haloform reaction, it must contain the group CH₃CO. Therefore it is a ketone and must be biutan-2-one.