Propanal on reaction with dilute NaOH, undergoes aldol condensation resulting in the formation of a compound A. Identify the correct structure of A and name of the compound.

For a reaction, \(2 A+B \longrightarrow\) products,
If concentration of \(B\) is kept constant and concentration of \(A\) is doubled then rate of reaction is

Pick up the correct statement.

In the presence of a catalyst at a given temperature of \(27^{\circ} \mathrm{C}\), the Activation energy of a specific reaction is reduced by \(100 \mathrm{~J} / \mathrm{mol}\). What is the ratio between the rate constants for the catalysed \((\mathrm{k}_2)\) and uncatalysed \((\mathrm{k}_1)\) reactions?

The element with atomic number \(36\) belongs to \(\ldots \ldots .\) block in the periodic table.

The colour of \(\mathrm{CrO}_4^{2-}\) changes to \(\mathrm{Cr}_2 \mathrm{O}_7^{2-}\) is

The photographic industry relies on the special light sensitive properties of

A particle shows distance-time curve as given in this figure. The maximum instantaneous velocity of the particle is around the point

Which defect leads to decrease in the density of crystal?

If a vertex of traingle is \((3,3)\) and the mid-points of two sides through this vertex are \(\left(2, \frac{3}{2}\right)\) and \(\left(4, \frac{3}{2}\right)\), then the centroid of the triangle is given by

Match the reactions in Column I with the correct products given in Column II:
\(\begin{array}{|l|l|l|l|} \hline \text{S.N.} & \text{Column I} & \text{S.No.} & \text{Column II} \\ \hline \text{A} & 1- \text{Chloropropane} + (\mathrm{Zn} / \mathrm{HCl}) \rightarrow & \text{P} & \text{Propanone + Methanal} \\ \hline \text{B} & n- \text{Hexane + (anh.} \left.\mathrm{AlCl}_3 / \mathrm{HCl}_{(\mathrm{g})}\right) \rightarrow & \text{Q} & \text{Propanone} \\ \hline \text{C} & 2- \text{Methylpropene} + ( \left.\mathrm{O}_3 ~\&~ \mathrm{Zn} / \mathrm{H}_2 \mathrm{O}\right) \rightarrow & \text{R} & \text{Propane} \\ \hline \text{D} & \text{Propyne} +\left(\mathrm{HgSO}_4 / \mathrm{H}_2 \mathrm{SO}_4\right. at 333 K) \rightarrow & \text{S} & \text{2-Methylpentane + 3-Methylpentane} \\ \hline \end{array}\)

A wind mill converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. The electrical power output P is related to the velocity of wind v as

The refractive index of a particular material is \(1.67\) for blue light, \(1.65\) for yellow light and 1.63 for red light. The dispersive power of the material is