Methanogens belong to $..........$.

Which of the following compounds undergoes sulfonation most easily?

Which of the following aqueous solutions will exhibit the highest boiling point?

$A$ particle is projected vertically upwards from a point $A$ on the ground. It takes time $t_1$ to reach a point $B$,and it continues to move up. If it takes a further time $t_2$ to reach the ground from point $B$,then the height of point $B$ from the ground is:

$A$ thin rod of length $L$ is bent to form a semicircle. The mass of the rod is $M$. What will be the gravitational potential at the centre of the circle?

The output $(X)$ of the logic circuit shown in the figure will be: