Which ketone is formed by the treatment of ethanenitrile and ethyl magnesium bromide ?

The product formed by the treatment of formaldehyde and ethyl magnesium bromide is subjected to treatment with dil. HCl. The product will be

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

Which product will be obtained by the hydrolysis of the product obtained by reaction of butane-nitrile with ethyl magnesium bromide ?

The compound obtained by the hydrolysis of the adduct formed by the reaction of ethyl magnesium bromide and acetadehyde is :