1. Tardigrade
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  4. Given, the structure of D - (+)-glucose as <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/ad034f72ee086102343c986b3cdf9324-.png /> The structure of L- ( + ) -glucose is

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Q. Given, the structure of $D - (+)$-glucose as image The structure of $L- ( + )$ -glucose is

KVPYKVPY 2014

Solution:

$D$ and $L$ before the name of any compound commonly indicates the relative configuration. For assigning the configuration of monosaccharides it is the lowest asymmetric carbon atom, which is compared to glyceraldehyde. For glucose, if —$OH$ on the lowest asymmetric carbon is on the right side. Then, it is assigned $D$-configuration and if $OH$ is on the left side then it is assigned $L$-configuration. Both $D$ and $L$ configuration are mirror images of each other.
image