Given below are two statements:
Statement I: Vanillin will react with NaOH and also with Tollen’s reagent.
Statement II: Vanillin will undergo self-aldol condensation very easily. 
In the light of the above statements, choose the most appropriate answer from the options given below:
Vanillin does not give self-aldol reaction due to the lack of acidic H for condensation.
It will react with NaOH and Tollen’s reagent, thus making Statement I correct.
Statement II is incorrect because vanillin does not undergo self-aldol condensation easily.
Chlorobenzene to biphenyl
Match the LIST-I with LIST-II

Choose the correct answer from the options given below:
If
$ 2^m 3^n 5^k, \text{ where } m, n, k \in \mathbb{N}, \text{ then } m + n + k \text{ is equal to:} $
A small point of mass \(m\) is placed at a distance \(2R\) from the center \(O\) of a big uniform solid sphere of mass \(M\) and radius \(R\). The gravitational force on \(m\) due to \(M\) is \(F_1\). A spherical part of radius \(R/3\) is removed from the big sphere as shown in the figure, and the gravitational force on \(m\) due to the remaining part of \(M\) is found to be \(F_2\). The value of the ratio \( F_1 : F_2 \) is: 
A uniform circular disc of radius \( R \) and mass \( M \) is rotating about an axis perpendicular to its plane and passing through its center. A small circular part of radius \( R/2 \) is removed from the original disc as shown in the figure. Find the moment of inertia of the remaining part of the original disc about the axis as given above.