AIEEE 2008 PYQ Mock Test

The absolute configuration of the following molecule is:

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

$\alpha \text{-D-(+)-glucose}$ and $\beta \text{-D-(+)-glucose}$ are:

Standard entropy of ${\text{X}}_2$, ${\text{Y}}_2$ and ${\text{XY}}_3$ are $60$, $40$ and $50{\text{J K}}^{-1}{\text{mol}}^{-1}$, respectively. For the reaction $\frac{1}{2}{\text{X}}_2+\frac{3}{2}{\text{Y}}_2\to {\text{XY}}_3$, $\Delta H=-30\text{kJ}$. For the reaction to be at equilibrium, the temperature will be:

Four species are listed below:(i) ${\text{HCO}}_3^{-}$ (ii) ${\text{H}}_3{\text{O}}^{+}$ (iii) ${\text{HSO}}_4^{-}$ (iv) ${\text{HSO}}_3\text{F}$ Which one of the following is the correct sequence of their acid strength?