Given below are two statements: 

Assertion (A): β -Glycosidic linkage is present in maltose.
Reason (R): Maltose is composed of two glucose units in which C- 1 of one glucose unit is linked to C- 4 of another glucose unit.

1. Assertion and reason both are correct statements and reason explain the assertion.
2. Assertion and reason both are correct statements but reason does not explain assertion. 
3. Assertion is the correct statement and reason is the wrong statement.
4. Assertion is the wrong statement and reason is the correct statement.

Hint: α-glycosidic linkage is present in maltose
Maltose is a disaccharide of glucose. In maltose, α-glycosidic linkage is present. The structure is as follows:
 

Because maltose is composed of two glucose units in which C-1 of one glucose unit is linked to C-4 of another glucose unit.

Hence, Assertion is the wrong statement and reason is the correct statement.

An alpha glycosidic linkage is formed between the carbons with the same stereochemistry. A beta glycosidic linkage is formed between the carbons having different stereochemistry.