18-68 Building a model will help visualize this problem. (a) H • • I :OyO CH20H -"":CH HO OH HO OH open-chain fonn OH OH w --same as H H I I -:OyO CH20H +-"":CH HOy�.yCH20H HO�OH OH cyclic fonn-hemiacetal -H H I I :OyC:O CH20H ••"CH·· + (b) Yes, the cyclic fonn of glucose will give a positive Tollens test. In the basic solution of the Tollens test, the hemiacetal is in equilibrium with the open-chain aldehyde with the cyclic fonn in much larger concentration. However, it is the open-chain aldehyde that reacts with silver ion, so even though there
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