Identify the product $(C)$ in the following series of reactions:
Cyclopentane $\xrightarrow{Br_2 (1 \ eq), h\nu} (A)$ $\xrightarrow{Alc. KOH} (B)$ $\xrightarrow{NBS} (C)$

The number of common tangents to the circles $x^2+y^2-4x-6y-12=0$ and $x^2+y^2+6x+18y+26=0$ is

$A$ body of mass $m$ is moving in a circle of radius $r$ with a constant speed $v$. The force on the body is $\frac{mv^2}{r}$ and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle?

There are $9$ balls to be placed in $9$ boxes. If $5$ of the balls cannot fit into $3$ specific small boxes,find the number of ways of arranging one ball in each of the boxes.

The resultant gate and its Boolean expression in the given circuit is

Which of the following compounds is formed by the addition of a mineral acid to an aqueous solution of borax?