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নিম্নের কোনটি এস্টার?

R - \overset{\overset{O}{| |}}{C -} O H

R - \overset{\overset{O}{| |}}{C -} O - R

R - \overset{\overset{O}{| |}}{C -} R

R - \overset{\overset{O}{| |}}{C - O -} \overset{\overset{O}{| |}}{C -} R

R - \overset{\overset{O}{| |}}{C -} N H_{2}

ANS : 2

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