Question: 4-Hydroxy- and 5-hydroxyaldehydes exist primarily in the cyclic hemiacetal form. Give the structure of the cyclic hemiacetal formed by each of the following: a. 4-hydroxybutanal

4-Hydroxy- and 5-hydroxyaldehydes exist primarily in the cyclic hemiacetal form. Give the structure of the cyclic hemiacetal formed by each of the following:
a. 4-hydroxybutanal
b. 5-hydroxypentanal
c. 4-hydroxypentanal
d. 4-hydroxyheptanal

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