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प्रश्न
Give reasons Although –NH2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline
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उत्तर
Nitration is usually carried out with a mixture of concentrated HNO3 and concentrated H2SO4. In the presence of these acids, most of aniline gets protonated to form anilinium ion. Therefore, in presence of acids, the reaction mixture consists of aniline and anilinium ion. Nitration of aniline due to steric hindrance at ortho position, mainly gives para nitroaniline and the nitration of anilinium ion gives m-nitroaniline. In actual practice, approximately 1:1 mixture of p-nitroaniline: m-nitroaniline is obtained.
Thus, nitration of aniline gives a substantial amount of m-nitroaniline due to protonation of the amino group.
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संबंधित प्रश्न
Convert aniline into 1, 3, 5-tribromobenzene.
Write the IUPAC name of the following compound and classify it as primary, secondary and tertiary amine.
C6H5NHCH3
Account for the following:
pKb of aniline is more than that of methylamine.
Accomplish the following conversion:
Aniline to benzyl alcohol
Complete the following reaction:
\[\ce{C6H5NH2 + H2SO4 (conc.)}\]
Complete the following reaction:
\[\ce{C6H5N2Cl ->[(i) HBF4][(ii) NaNO2/Cu, \Delta]}\]
What is the action of p-toluenesulphonychloride on ethylamine and diethylamine?
Using IUPAC norms, write the formula of Hexaamminecobalt(III) sulphate.
An organic compound (A) with molecular formula C3H7NO on heating with Br2 and KOH forms a compound (B). Compound (B) on heating with CHCl3 and alcoholic KOH produces a foul-smelling compound (C) and on reacting with C6H5SO2Cl forms a compound (D) which is soluble in alkali. Write the structure of (A), (B), (C) and (D).
Predict the product 'A' in the following reaction.
\[\ce{\underset{(Acetyl chloride)}{CH3COCl}->[H2][Pd-BaSO4]A + HCl}\]
