Chloroethane reacts with $X$ to form diethyl ether. What is $X$?

The distance between the parallel lines given by $(x+7y)^2 + 4\sqrt{2}(x+7y) - 42 = 0$ is

For any integer $n \geq 1$, the number of positive divisors of $n$ is denoted by $d(n)$. Then, for a prime $P$, $d(d(d(P^7)))$ is equal to

If the normal to the curve $y(x) = \int_0^x (2t^2 - 15t + 10) dt$ at a point $(a, b)$ is parallel to the line $x + 3y = -5$,where $a > 1$,then the value of $|a + 6b|$ is equal to...........

Euchlorine is a mixture of

The equation $\sqrt{3} \sin x + \cos x = 4$ has