An organic compound (A), which undergoes haloform reaction, gives compound 'B'. On reduction with NaBH4. 'B' on heating with sulphuric acid forms compound 'C' which forms mono-ozonide 'D'. 'D' on hydrolysis in presence of Zn dust gives only acetaldehyde. The compound 'A' is:
1
Dimethyl ketone
2
Methyl propyl Ketone
3
Methyl ethyl ketone
4
Diethyl Ketone