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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. They are very essential for the body. They has to be taken various diet or in the form of medicines also.
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. These must be supplied regularly in diet because they are readily excreated in urine and cannot be stored in our body.
Deficiency of Scurvy disease leads to

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

(A) Conc. \(\mathrm{HNO}_3 /\) Conc. \(\mathrm{H}_2 \mathrm{SO}_4\)
(B) \(\mathrm{Sn} / \mathrm{HCl}\)
(C) \(\mathrm{Br}_2 / \mathrm{FeBr}_3\)
(D) \(\mathrm{NaNO}_2 / \mathrm{HCl}\); followed by boiling with water
Choose the correct answer from the options given below:

The major product of Kolbe's reaction is used for the synthesis of a precursor substrate in the preparation of aspirin
The electrophile used in Kolbe's reaction is

The source of electrical energy on the Apollo moon flight was:

Antiseptics and disinfectants either kill or prevent growth of micro-organism. Identify which of the following statements is not true?
(A) Disinfectants harm the living tissues.
(B) A 0.2% solution of phenol is an antiseptic while 1% solution acts as a disinfectant.
(C) Chlorine and Iodine are used as strong disinfectants.
(D) Dilute solution of boric acid and hydrogen peroxide are antiseptics
Choose the correct answer from the options given below :

Read the passage carefully and answer the questions:
The degeneracy of the \(d\) orbitals has been removed due to ligand electron-metal electron repulsions in the octahedral complex to yield three orbitals of lower energy, \(t_{2 g}\) set and two orbitals of higher energy, \(e_g\) set. This splitting of the degenerate levels due to the presence of ligands in a definite geometry is termed as crystal field splitting and the energy separation is denoted by \(\Delta_0\). Thus energy of the two \(e_g\) orbitals will increase by \((3 / 5) \Delta_0\) and that of three \(t_{2 g}\) will decrease by \((2 / 5) \Delta_0\). The crystal field splitting \(\Delta_{\circ}\) depends upon the field produced by the ligand and charge on the metal ion. Some ligands are able to produce strong fields, in which case the splitting will be large, whereas others produce weak fields and consequently result in small splitting of \(d\) orbitals. Relative magnitude of crystal field splitting energy \(\Delta_{\circ}\) and pairing energy, \(P\) (energy required for electron pairing in a single orbital) determine the formation of low spin ( \(\Delta_{\circ}>P\) ) or high spin ( \(\Delta_{\circ}<P\) ) complex. In tetrahedral coordination entity formation, the \(d\)-orbital splitting is inverted and is smaller as compared to the octahedral field splitting. The crystal field theory attributes the colour of the complex to \(d-d\) transition of the electron. The colour of the coordination compounds depends on the crystal field splitting. In the absence of ligand, crystal field splitting does not occur and hence the substance is colourless.
Which of the following complex is not expected to be coloured?

Rusting of Iron is catalyzed by:

Insulin is the example of

In alcohols, C-O-H bond angle is:

The first clinical gene therapy was given for the treatment of:

The synthesis of alkyl fluoride is best achieved through

The shortest distance between the lines\(\frac{x-1}{2}=\frac{y-2}{3}=\frac{z+4}{6}\)and\(\frac{x-3}{4}=\frac{y-3}{6}=\frac{z+5}{12}\) is :

A cell of emf \( \mathcal{E} = 10 \text{ V} \) and internal resistance \( r = 3 \Omega \) is connected to a uniform wire of length \( L = 500 \text{ cm} \) and resistance \( R = 3 \Omega \). The drop of potential with length in the wire is: