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5-hydroxy-3-methylpentanoic acid forms a cyclic ester (lactone) when it is mixed with a trace amount of acid.(i) Write the structure of the lactone.(ii) Suggest a plausible mechanism for its formation.

5-hydroxy-3-methylpentanoic acid forms a cyclic ester (lactone) when it is mixed with a trace amount of acid.

(i) Write the structure of the lactone.
(ii) Suggest a plausible mechanism for its formation.