Find the IUPAC name of the compound.

The given compound is a substituted benzoic acid. We need to identify the positions of the substituents and name the compound according to the IUPAC rules. - The parent structure is benzoic acid, with a carboxyl group (-COOH) at position
1. - The other substituents are: - A bromine (Br) group attached at position
2. - A nitro (NO\(_2\)) group attached at position 3. Thus, the correct IUPAC name for this compound is 2-Bromo-3-nitrobenzoic acid.


Designate whether each of the following compounds is aromatic or not aromatic.

In the given figure, the blocks $A$, $B$ and $C$ weigh $4\,\text{kg}$, $6\,\text{kg}$ and $8\,\text{kg}$ respectively. The coefficient of sliding friction between any two surfaces is $0.5$. The force $\vec{F}$ required to slide the block $C$ with constant speed is ___ N.
(Given: $g = 10\,\text{m s}^{-2}$) 
Two circular discs of radius \(10\) cm each are joined at their centres by a rod, as shown in the figure. The length of the rod is \(30\) cm and its mass is \(600\) g. The mass of each disc is also \(600\) g. If the applied torque between the two discs is \(43\times10^{-7}\) dyne·cm, then the angular acceleration of the system about the given axis \(AB\) is ________ rad s\(^{-2}\).
