The bond order of individual carbon-carbon bonds in benzene is

The order of the differential equation whose solution is $y = a \cos x + b \sin x + c e^{-x}$ is:

If the best and the worst paper never appear together,then in how many ways can six examination papers be arranged?

In a single slit diffraction experiment, the first minimum for red light $(\lambda = 660 \, nm)$ coincides with the first secondary maximum of some other wavelength $\lambda'$. The value of $\lambda'$ is ...... $\mathring{A}$.

Which of the following hormones does not naturally occur in plants?

$A$ compound $(A)$ is used in the preparation of washing soda to recover ammonia in the Solvay process. When $CO_2$ is bubbled through an aqueous solution of $(A)$,the solution turns milky. It is also used in whitewashing due to its disinfectant nature. What is the chemical formula of $(A)$?