A ketone reacted with $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgBr}$ followed by hydrolysis gave pr

Question

A ketone reacted with $\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{MgBr}$ followed by hydrolysis gave product which on dehydration gives an alkene. The alkene on ozonolysis gave diethyl ketone and acetaldehyde. The ketone is\

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