The oxoacid of sulphur which has a lone pair of electron on sulphur atom is:

Name the reaction when carboxyclic acids having an a -hydrogen are halogenated at the a-position on treatment with chlorine in the presence of a small amount of red phosphorus.

Salicylaldehyde can be prepared by treating phenol with

Read the passage carefully and answer the questions
The resistance ( \(R\) ) of an object is given by the expression \(R=\rho \frac{l}{A} .\)
The inverse of \(R\) is called conductance and the inverse of \(\rho\) is called conductivity or specific conductance represented by \(\kappa\).
The conductivity depends upon the nature of the material (insulator, semiconductor or conductor) and the temperature of the substance.
Similarly, the conductance due to the ions present in the solution (ionic conductance) depends upon the nature of the electrolyte, size of ions, the nature of the solvent and the temperature.
Molar conductivity ( \(\Lambda_m\) ) of a solution at a given concentration is the conductance of volume \(V\) containing one mole of electrolyte kept between two electrodes of area \(A\) and unit distance apart.
It is given by the expression \(\Lambda_m=\kappa V .\)
Molar conductivity increases with decrease in concentration and when concentration approaches zero, it is called limiting molar conductivity.
The decrease is linear for a strong electrolyte. However, for a weak electrolyte the change is gradual at higher concentrations and sharp near zero concentration.
Using limiting molar conductivity values of strong electrolytes we can calculate the limiting molar conductivity of weak electrolytes using Kohlrausch law of independent migration of ions.
From molar conductivity and limiting molar conductivity we can determine the degree of dissociation \(\left(\frac{\Lambda_m}{\Lambda_m^0}\right)\) and the ionization constant of a weak acid.
Select the correct statement.

What is the correct order of following steps in the preparation of potassiu Solutionm permanganate?
(A) disproportionation in a neutral or acidic solution
(B) production of dark green \(K _2 MnO _4\)
(C) \(MnO _2\)
(D) fusion with alkali metal hydroxide and \(KNO _3\)
Choose the correct answer from the options given below:

Which of the following amine will not undergo acylation reaction?

The magnetic nature of elements depends on the presence of unpaired electrons.
Identify the configuration of a transition element which shows the highest magnetic moment:

The relation \(R\) on set \(A=\{1,2,3,4,5\}\), given by \(R=\{(a, b):|a-b|\) is even \(\}\) is :

The magnetic dipole moment associated with an atom due to orbital motion of an electron in fourth stationary orbit of the hydrogen atom is :

The point on the unit circle with center (0, 0); where tangents are equally inclined to the co-ordinate axes are:

Identify the correct statements from the given below:
(A) Alcohols are less basic than amines.
(B) Aromatic primary amines can be prepared by Gabriel phthalimide synthesis.
(C) Primary amines have higher boiling points than tertiary amines.
(D) Carbylamine test can be used as a test for both primary aliphatic and aromatic amines
Choose the correct answer from the options given below:

If \(y=\sin ^{-1}\left(\frac{1-x^2}{1+x^2}\right)\) then \(\frac{d y}{d x}=\)

Which one of the following statements is correct about Saccharomyces cerevisiae?