To prepare 3-ethylpentan-3-ol, the reactants needed are

3-penten-1-ol

4-cyano-4-ethylpentan-3-one

Which of the following compounds gives 3-ethylpentan-3-ol by the action of ethy magnesium iodide followed by acid hydrolysis?

3-methylbut-3-en-1-ol

Which ketone will form 3- ethylpentan -3-ol on treatment with ethy1 magnesium bromide ?