Give an example. The two different secondary structures possible are α-helix structure and β-pleated sheet structure. • The following paragraphs describe aniline production from nitrobenzene via a liquid-phase hydrogenation process, similar to the one owned by DuPont (Wilmington, Del. It is then chlorinated to form 2,4,6-trichloroaniline. (b) Complete the following chemical equations: (i) The acidity of a molecule depends on the polarity of the bond between central atom and the hydrogen atom. The secondary structure of proteins: The secondary structure of proteins refers to the shape in which a long polypeptide can exist. (Molar mass of MgBr2 = 184 g) (Kf for water = 1.86 K kg mol-1). 2. • The structure can be drawn as follows. (Kb for water = 0.512 K kg mol-1), (Molar mass of NaCl = 58.44 g). (iii) In SN1 reaction mechanism leads through the carbocation pathway. Verify your number to create your account, Sign up with different email address/mobile number, NEWSLETTER : Get latest updates in your inbox, Need assistance? a quaternary ammonium salt. All rights reserved. Uses include: (ii) Food Preservatives: These are the chemical substances which are added to the food materials to prevent their spoilage and to retain their nutritive value for long periods. As a result, NF3 is an exothermic compound. Is the osmotic pressure of a solution a colligative property? F-F bond has low enthalpy because the fluorine atom has a small size and due to their small size, there is repulsion between two atoms making its bond enthalpy lower, hence more reactivity is more. And the polarity of the bond depends on the electronegativity of the central atom. (iii) Antacids: Any drug that is used to counteract the effects of excess acid in the stomach and raise the pH to an appropriate level is called an antacid. © Then aqueous NaOH is added to the aniline salt to get released aniline. Uses include: Non-ionic or neutral: Having an uncharged head. i) Nitrobenzene into aniline The three types of amines can be distinguished by Hinsberg method. The osmotic pressure is expressed as. Hence, osmotic pressure is a colligative property. What happens when Benzene diazonium chloride reacts with Benzene in presence of alkali? Aniline salt has weak acidic characteristics. Aniline salt. Aniline salt and NaOH reaction. CBSE Class 12 Chemistry Solved Question Paper 2011, Class 11 NCERT Political Science Solutions, Class 11 NCERT Business Studies Solutions, Class 12 NCERT Political Science Solutions, Class 12 NCERT Business Studies Solutions, https://www.zigya.com/share/Q0hFTjEyMTEwODc1. Figure 1 presents a simplified flow diagram of the process showing the main pieces of equipment. Thus, the acidic strength of the hydrides decreases in the. (ii) A mixture of equal amounts of two enantiomers is known as racemic mixture. (iii) Of the two Bromo derivatives, C6H5CH(CH3)Br and C6H5CH(C6H5)Br, which one is more reactive in Sn1 substitution reaction and why? Nitrobenzene is reduced to aniline by Sn and concentrated HCl. https://www.zigya.com/previous-year-papers/CBSE/12/Chemistry/2011/CBSE2011001. What is a coupling reaction? More stable the carbocation, more reactive will be substrate .the carbocation formed by two compounds are as follows: Compound (C6H5)2CHBr = carbocation (C6H5)2CH+, Compound C6H5CH(CH3)Br=carbocation C6H5(CH3)CH+. What is Diazotization reaction? ; www.dupont.com). While molarity decreases with an increase in temperature, molality is independent of temperature. November 4, 2016, 3:00pm #1. Write the chemical The hydrogenation is carried out in the liquid phase and the nitrobenzene conversion to aniline is near 100% in a single pass. (i) The acidic strength decreases in the order HCl > H2S > PH3. (i) α-Helical structure: In α-Helix structure, a polypeptide chain forms all possible hydrogen bonds by twisting into a helix with -NH group of each amino acid residue and hydrogen bonded to >C=O of an adjacent turn of the helix. (ii) benzene into N, N-dimethyl aniline? (ii) β-pleated structure: In a β-pleated structure, all peptide chains are stretched out to nearly maximum extensions and then laid side by side which are held together by intermolecular hydrogen bonds. Amine will accept a proton and from cation will be stabilized in water by salvation (by hydrogen bonding).better the salvation by hydrogen bonding higher will be the basic strength.Hence, alkyl amine is more basic than ammonia CH3NH2 > NH3. 232, Block C-3, Janakpuri, New Delhi, Cloudflare Ray ID: 5f7d47642d1beadb Nitrobenzene is reduced to phenylammonium ions using a mixture of tin and concentrated hydrochloric acid. This video explains the Sandmeyer and Gatterman reaction of diazonium salt. For example: When a 3° halide undergoes substitution with KOH, the reaction proceeds through SN 1 mechanism forming the racemic mixture in which one of the products has the same configuration as a reactant, while the other product has an inverted configuration. Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day. Aniline salt is given from this reaction. (i) Nitrobenzene to benzoic acid (ii) Benzene to m-bromophenol (iii) Benzoic acid to aniline (iv) Aniline to 2,4,6-tribromofluorobenzene (v) Benzyl chloride to 2-phenylethanamine (vi) Chlorobenzene to p-chloroaniline (vii) Aniline to p-bromoaniline (viii) Benzamide to toluene (ix) Aniline to benzyl alcohol.