For the following questions answer them individually
Identify the conect statements:
The presence of - $$NO_{2}$$ group in benzene ring
A. activates the ring towards electrophilic substitutions.
B. deactivates the ring towards electrophilic substitutions.
C. activates the ring towards nucleophilic substitutions.
D. deactivates the ring towards nucleophilic substitutions.
choose the correct answer from the options given below :
The wavelength of photon ' A' is 400 nm. The frequency of photon ' B' is $$10^{16}s^{-1}$$. The wave number of photon 'C is $$10^{4}cm^{-1}$$.The correct order of energy of these photons is :
A student performed analysis of aliphatic organic compound 'X' which on analysis gave C =61.01 % H =15.25%, N=23.74%.
This compound, on treatment with $$HNO_{2}/H_{2}O$$ produced another compound 'Y' which did not contain any nitrogen atom However, the compound 'Y' upon controlled oxidation produced another compound 'Z' that responded to iodoform test.
The structure of 'X' is :
which of the following reaction is NOT correctly represented?
Total nwnber of alkali insoluble solid sulphonamides obtained by reaction of given amines with Hinsberg's reagent is_______.
Aniline, N-Methylaniline, Methanamine, N, N - Dimethylmetharuunine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylanjline, N, N-Dlmethylaniline, Allyl amine,Isopropyl amine
The correct increasing o rd e r of spin-only magnetic moment values of the complex ions $$[MnBr_{4}]^{2-}(A),[Cu(H_{2}O)_{6}]^{2+}(B),[Ni(CN)_{4}]^{2-}(C)\text{ and }[Ni(H_{2}O)_{6}]^{2+}(D)$$ is:
Observe the following equilibrium in a 1 L flask.
$$A(g)\rightleftharpoons B(g)$$
At T(K), the equilibrium concentrations of A and B are 0.5 Mand 0.375 M respectively. 0.1 moles of A is added into the flask and heated to T(K) to establish the equilibrium again. The new equilibrium concentrations (in M) of A and B are respectively
Given below are two statements :
Statement I : The increasing order of boiling point of hydrogen halides is $$HCl < HBr < HI < HF$$.
Statement II: The increasing order of melting point of hydrogen halides is $$HCl < HBr < HF < HI$$.
In the light of the above statements, choose the correct answer from the options given below :
Structures of four disaccharides are given below. Among the given disaccharides, the non-reducing sugar is :
For the given reaction;
$$CaCO_{3}+2HCl\rightarrow CaCl_{2}+H_{2}O+CO_{2}$$
If 90 g $$CaCO_{3}$$ is added to 300 mL of HCI which contains 38.55% HCI by mass and has density 1.13 g $$mol^{-1}$$, then which of the following option is correct ?
Given molar mass of H, Cl, Ca and Oare 1, 35.5, 40 and 16 g $$mol^{-1}$$ respectively.
