20. A: Two moles of Grignard reagent is consumed in the formation of tertiary alcohol from ester followed by hydrolysis. R: One mole of Grignard reagent convert ester into Ketone and second mole of Grignard reagent adds to Ketone.

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\begin{matrix} a. & Addition of benzyl Grignard reagent to acetaldehyde (ethanal), followed by hydrolysis. b. & Addition of phenyl lithium to propylene oxide (methyloxirane), followed by hydrolysis. c. & Addition of phenyl Grignard reagent to acetone (2- propanone) followed by hydrolysis. d. & Acid- catalysed hydration (addition of water to) of 2-Phenyl-1- propene. e. & Addition of methyl Grignard reagent to acetophenone (methyl phenyl ketone), followed by hydrolysis. f. & Addition of methyl Grignard reagent to phenylacetaldehyde, followed by hydrolysis. \end{matrix}

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