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নিচের কোনটি Ester?

R - \overset{\underset{| |}{O}}{C} - O - R^{'}

R - \underset{\overset{| |}{O}}{C} - O - R^{'} - R^{'}

R - \overset{\underset{| |}{O}}{C} - R^{"}

R - COOH - O

Neither of these

ANS : 1

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