When $tert$-butyl bromide is heated with silver fluoride,the major product obtained is:

Which of the following pairs is correctly matched?
$(i)$. Fungi - Regeneration
$(ii)$. Mosses - Fragmentation
$(iii)$. Planaria - Budding

$A$ given charge is situated at a certain distance from an electric dipole in the end-on position experiences a force $F$. If the distance of the charge is doubled,the force acting on the charge will be

Which of the following elements has the highest reaction rate with water?

If the variable line $y = kx + 2h$ is tangent to an ellipse $2x^2 + 3y^2 = 6$,then the locus of $P(h, k)$ is a conic $C$ whose eccentricity equals

$A$ point moves with uniform acceleration and $v_1, v_2$ and $v_3$ denote the average velocities in the three successive intervals of time $t_1, t_2$ and $t_3$. Which of the following relations is correct?