The diagrams represent two monosaccharides with the same molecular formula $\left( {{C_6}{H_{12}}{O_6}} \right)$.
Both can exist in an alpha ($\alpha $) or beta ($\beta $) form as shown.
The diagram shows a lactose molecule formed by condensation between glucose and galactose.
Which molecules have condensed to form lactose?
1 )
$\alpha $-glucose and $\alpha $-galactose
2 )
$\alpha $-glucose and $\beta $-galactose
3 )
$\beta $-glucose and $\alpha $-galactose
$\beta $-glucose and $\beta $-galactose
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