in a plastic tap

Acetal formation is a characteristic of a cyclic sugar. and acetal is formed when a hemiacetals react with an alcohol.

If this hemiacetal group is sugar( glucose) and react with an alcohol to form an acetal ,it is known as glycoside.

the other compound may or may not be monosaccharide.so in its cycle form it can not form acetal due to instability in configuration .

No. It is a hemi-acetal.

An acetonide is a cycliic acetal derived from acetone and a diol.

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R-c - H

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this is the general formula for an acetal in R-group notation