$$\alpha$$-D-(+)-glucose and $$\beta$$-D-(+)-glucose are

Among the following substituted silanes the one which will give rise to cross linked silicone polymer on hydrolysis is :

The electrophile, $${E^ \oplus }$$ attacks the benzene ring to generate the intermediate $$\sigma - $$complex. Of the following, which $$\sigma - $$complex is lowest energy?

The absolute configuration of