Which of the following is the strongest oxidizing agent?

The refractive index of a material of a plano-concave lens is $5/3$,and the radius of curvature is $0.3 ~m$. The focal length of the lens in air is (in $~m$)

Which of the following reacts with benzene in the presence of anhydrous aluminum chloride to form acetophenone?

Identify the glycosidic linkage present in maltose.

An observer moves towards a stationary source of sound with a velocity of one-fifth of the velocity of sound. The percentage increase in the apparent frequency is (in $\%$)

The figure shows a system of logic gates. From the study of the truth table,it can be found that to produce a high output $(1)$ at $R$,we must have