Which of the following statements is correct?

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(D) $1$. $\alpha-D$-glucose and $\beta-D$-glucose are anomers,not enantiomers,because they differ in configuration only at the $C-1$ carbon.$2$. Glyci

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In Dumas method,nitrogen present in a compound is estimated as $N_2$ gas.

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(D) $1$. $\alpha-D$-glucose and $\beta-D$-glucose are anomers,not enantiomers,because they differ in configuration only at the $C-1$ carbon.$2$. Glycine $(NH_2CH_2COOH)$ is the only amino acid that is optically inactive because it lacks a chiral carbon atom.$3$. Cellulose is a linear polymer of $\beta-D$-glucose units linked by $\beta-1,4$-glycosidic bonds; therefore,its hydrolysis yields $\beta-D$-glucose.$4$. In the Dumas method,the nitrogen contained in an organic compound is oxidized to $N_2$ gas,which is then collected and measured. Thus,this statement is correct.

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