What is the product of the reaction of propenoic acid with ethyl lithium followed by acid hydrolysis?

Which of the following is the product of reaction of ethane nitrile with Grignard reagent followed by acid hydrolysis?

What is the hydrolysis product of hypophosphoric acid ?

What is the major product obtained when two moles of ethyl magnesium bromide is treated with methyl benzoate followed by acid hydrolysis?