Which of the following vitamins is soluble in water?

Benzene ring in phenol is expected to give the characteristic substitution or replacement reactions i.e. halogenation, nitration, sulphonation, alkylation etc. In these reactions, the attacking reagent is electrophile. The phenolic group activates the ortho and para positions in the ring due to conjugation. Disubstitution reactions are quite fast as the electron density in the ring has increased considerably. Phenols do not respond to nucleophilic substitution reactions as it is influenced by phenolic group.

Match List-I with List-II

List-I (Name of the test/Reaction)	List-II (Species)
(A) Tollen's Test	(I) \(Cu ^{2+} a n d OH ^{-}\)
(B) Fehling's Test	(II) \(Zn - Hg and HCl\)
(C) Clemmensen reduction	(III) \(2\left[ Ag \left(NH _3\right)_2\right]^{+} \) and \(OH ^{-}\)
(D) Wolff Kishner reduction	(IV) Hydrazine KOH /ethylene glycol

Choose the correct answer from the options given below :

Match List-I (type of linkages) with List-II (Biomolecules)

List-I (Type of linkage)	List-II (Biomolecule)
(A) Glycosidic linkage	(I) Tertiary structure of proteins
(B) Peptide Linkage	(II) Disaccharide
(C) Phosphodiester linkage	(III) Primary structure of proteins
(D) Disulfide linkage	(IV) Nucleotide

Choose the correct answer from the options given below:

Which of the following is more reliable ?

Predict the correct sequence of reagents to carry out the following conversion:

o-Nitrophenol is less soluble in water than p-nitrophenol because :

A parallel beam of light of wave length 500 nm in incident normally on a single slit of width \( 10^{-6} \, \text{m} \). The light is focused by a convex lens on a screen placed in focal plane.

Read the Passage carefully and answer the Questions
Kinetic studies not only help us to determine the rate of a chemical reaction but also describe the conditions by which the reaction rates can be altered. The factors such as concentration, temperature, pressure and catalyst affect the rate of a reaction. The speed of a reaction or the rate of a reaction can be defined as the change in concentration of a reactant or product in unit time.
Rate \(= \text{k}[\text{A}]^x [\text{B}]^y\)
Here k is the rate constant
\(x + y\) gives the overall order of a reaction, whereas \(x\) and \(y\) represent the order with respect to the reactants A and B, respectively.
If the temperature is raised by \(10^\circ\text{C}\), then the rate of the reaction increases approximately by:

Forward bias applied to a p-n junction diode

The maximum value of \(\left(\frac{1}{x}\right)^x\) for \(x>0\) is

Two ropes are tied along the two diagonals of a cubic room. Ropes are inclined to each other at :

\(\int \frac{e^x(1+x) d x}{\cos ^2\left(e^x x\right)}\) is equal to: