Chlorination of toluene in the presence of light and heat followed by treatment with aqueous $NaOH$ yields:

$A$ lens of power $+2 \text{ diopters}$ is placed in contact with a lens of power $-1 \text{ diopter}$. The combination will behave like:

$A$ proton, a deuteron, and an $\alpha$-particle having the same momentum enter a region of uniform electric field between the parallel plates of a capacitor. The electric field is perpendicular to the initial path of the particles. The ratio of deflections suffered by them is

Which one of the following orders is correct for the first ionisation energies of the elements?

The current $I$ in the circuit will be:

$\int(x+1)^2 e^x d x$ is equal to