Which of the following compound gives a ketone with Grignard reagent:

The formula of Grignard reagent is RMgX and when it reacts with different organic compounds to give different products. So, when it reacts with formaldehyde there is formation of primary alcohol. When it reacts with ethyl alcohol, methane is formed and later ethyl alcohol is also formed. When it reacts with methyl cyanide it forms ketone. With methyl iodide it forms alkane. 3) 3 3 4) (methyliodide) (Alkane) CH I R MgBr CH R MgBrI →