The correct reaction/reaction sequence that would produce a dicarboxylic acid as the major product is

The complete hydrolysis of $ICl , ClF _3$ and $BrF _5$, respectively, gives

The perimeter of a $\triangle ABC$ is $6$ times the arithmetic mean of the sine of its angles. If its side $BC$ is of unit length,then $\angle A=$

Power supplied to a particle of mass $2\, kg$ varies with time as $P = \frac{3t^2}{2} \, W$. Here $t$ is in $seconds$. If the velocity of the particle at $t = 0$ is $v = 0$,the velocity of the particle at time $t = 2\, s$ will be ........... $m/s$.

In $Pteridophytes$,reduction division occurs when -

Among the following ions,which one has the highest paramagnetism?