Arrange the following alkyl halides in order of increasing reactivity towards \(S_N^1\) reaction.
(A) \(\left( CH _3\right)_3 C - I\)
(B) \(\left( CH _3\right)_3 C - F\)
(C) \(\left( CH _3\right)_3 C - Br\)
(D) \(\left( CH _3\right)_3 C - Cl\)
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The term vitamin was coined from the word vital +amine since the earlier identified compounds had amino groups. Later work showed that most of them didn't contain amino groups, so the letter "e" was dropped and ther term vitamin is used these days.
Vitamins are classified into two groups depending upon their solubility in water or fat. Fat soluble vitamins are soluble in fat and oils but insoluble in water. They are stored in liver and adipose (fat storing) tissues. Water-soluble vitamins are soluble in water. They must be supplied regularly in the diet as they are readily excreated in urine.
What are the sources of Vitamin B12?

Select the correct formula for the coordination compound "Dichloridobis(ethane-1,2-diamine)cobalt(III) chloride"

What is the product of nitration of Benzoic acid?

Arrange the following in the increasing order of their solubility in n-octane on the basis of their solute-solvent interaction:
(A) KCI
(B) CH3OH
(C) CH3CN
(D) Cyclohexane
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An increase in the density is seen when moving from Ti to Cu in transition mental series. This can be attributed to ....

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The transition metals and their compounds are known for their catalytic activity. This activity is ascribed to their ability to adopt multiple oxidation states and to form complexes. Vanadium(V) oxide (in Contact Process), finely divided iron, and nickel (in Catalytic Hydrogenation) are some of the examples. Catalysts at a solid surface involve the formation of bonds between reactant molecules and atoms of the surface of the catalyst (first row transition metals utilise 3d and 4s electrons for bonding). This has the effect of increasing the concentration of the reactants at the catalyst surface and also weakening of the bonds in the reacting molecules (the activation energy is lowering). Also because the transition metal ions can change their oxidation states, they become more effective as catalysts. Reaction between iodide and persulphate ions takes place as follows: \(2I^- + S_2O_8^{2-} \rightarrow I_2 + 2SO_4^{2-}\)
Which of the following catalyses the above reaction?

Lanthanoids (Ln) when heated with nitrogen, form compounds of the type ______________

Which of the following is the range of the principal value of \(\sec ^{-1} x\) ?

A person has set up a sinking fund in order to have Rs. 10,00,000 after 10 years for his child education. The amount should put bi-annually into account paying 5 % per annum compounded semi-annually is:
[Given \((1.025)^{20}=1.6386\)]

Which sodium halide is employed in Finkelstein reaction?

A wire of resistance \( 5 \, \Omega \) is drawn out so that its length is increased to thrice its original length. The new resistance would be :

Identify the correct statements for adenosine deaminase (ADA) deficiency.
(A) It is caused by the failure of synthesis of an enzyme, adenosine
deaminase.
(B) It leads to inherited immunodeficiency disorder, severe combined
immunodeficiency (SCID).
(C) It is attributed to a mutant ADA gene.
(D) Its treatment can be done by introducing ADA cDNA into the
hepatocytes.
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