Reactions of Aryl Amines (Diazo Salts)

Q. How many H\ast ions are present in 1 ml of a solution whose pH is 13?(1) 10-16(2) 6.022 x 1013(4) 6.022 x 1023(3) 6.022 x 107

Q.

Alkyl groups directly attached to the positively charged carbon stabilize the carbocations due to:

1. Resonance effect

2. Inductive and hyperconjugation effect

3. Isomerism

4. Chirality

Q. 38. In Dumas method of estimation of nitrogen 0.35g of an organic compound have 55 ml of nitrogen collected at 300K temperature and 715 mm pressure.The percentage of nitrogen in compound is. Aqueous tension at 300 K is 15mm

Q.

1g mixture of CaCO₃ and NaCl reacts completely with 100 ml of N/10 HCl. The % of CaCO₃ in the mixture is

Q. 8. Which of the following increasing order of pH of 0.1M solutions of the compound A-HCOONH4 B- CH3COONH4 C- CH3COONa D- NH4Cl is correct

Q. Explain resonance in borazine also find degree of unsaturation of borazine (Inorganic Benzene)

Q. Which one of the following will give primary amine on hydrolysis?

1. Nitroparaffin

2. Alkyl cyanide

3. Amide

4. Alkyl isocyanide

Q. 39. Which of the following statement is incorrect about the reaction of ammonia derivatives with carbonyl compounds 1) pH of solution is maintained between 3 to 4 2) addition of ammonia derivatives occurs followed by elimination of water 3) at very low pH less than 3 Ammonia derivatives are protonated and do not act as nucleophile 4) at very high pH reaction becomes explosive

Q. titration is carried out in between N/10 acetic acid and N/10 NaOH .how much difference will be there in pH values of the solutions obtained by 30% and 60% completion of titration

Q. Equivalent volume of CO_2 in the following reaction will be Na_2CO_3+HCl→ NaCl+H_2O+CO_{

Q. 74 In which of the following compounds is steric inhibition of resonance effect will operate A. 1, 2, 3 trimethylbenzene B. 3, 5 dimethyl nitroBenzene C. 2, 6 dimethyl nitrobenzene D. 2 methyl nitrobenzene

Q. The dissociation constant of a weak acid HCOOH is 10–4. A solution is made containing 6.8 g HCOONa for every 46 g HCOOH. The pH of the solution is nearly equal to

Q. the pH of a solution obtained by dissolving 0.1 mole of an acid HA in 100ml of the aqueous solution was found to be 3.0.calculate the dissociation constant of the acid.

Q. a solution of weak monoprotic acid(0.1M) of Ka=10^{-5} is kept at 298K then what will be the pH of this solution?

Q. The alkene R-CH = CH2 reacts readily with B2H6and the product on oxidation with alkaline hydrogenperoxides produces(1) R-C\overset⇀{(CH3)}=O(2) R-CH(OH)-CH2OH (3)R-CH-CHO(4) R-CH2-CH2 OH

Q. Calculate the ratio of pH of a solution containing 1 mole of CH_3COONa+ 1 mole of HCl and of other solution containing 1 mole CH_3COONa+ 1mole of acetic acid per litre- (1) 1 : 1 (2) 2 : 1 (3) 1 : 2 (4) 2 : 3

Q. Differentiate between the principle of estimation of nitrogen in an organic compound by

Q. +R and - R effect are applicable only of benzene or also for other unsaturated compounds showing resonance?

Q. Find the concentration of HCO_3^-, in a 0.01Msolution of carbonuc acid if pH of this solution is 4.18.Ka_1 for H2CO3=4.45x10^-

Q. Equal volumes of three acid solutions of pH-3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?

Q. The enthalpy of hydrogenation of cyclohexene is -119.5 KJ. If resonance energy of benzene is -150.4 KJ its enthapy of hydrogenation will be

Q. 8. Show resonance in tertiary benzylic and tertiary allylic in diagram

Q. Q 9/15 Calculate pH of 0.1 M solution of NH4CI. Thedissociation constant (K) of NH3 is 1.8 x 10578.885.124.28

Q. which one of the following act only as a base 1] h2s 2]hs^- 3] s^2- 4] h2o

Q. Identify incorrect statements among the following
I. Benzene diazonium chloride with hypophosphorous acid solution gives benzeneamine and phosphorous acid
II. Benzene diazonium chloride with phenol at P^H> 7 gives yellow coloured dye
III. Benzene diazonium chloride with cuprous chloride and HCl gives chlorobenzene is called as Gattermann reaction

IV. Benzenediazonium chloride on hydrolysis with water at 10⁰C gives phenol

1. All

2. I, III, IV

3. II, III only

4. I, II, III

Q. 44. In which of the following acid-base titration, pH is greater than 8 at equivalence point? (1) Acetic acid versus ammonia (2) Acetic acid versus sodium hydroxide (3) Hydrochloric acid versus ammonia (4) Hydrochloric acid versus sodium hydroxide

Q. The pHpH of a solution is 5.00. To this solution, sufficient acid is added to lower the pHpH to 2.00. The corresponding increase in H3O+H3O+ ion concentration is

Q. 46.The oxidation of benzene by V20, in presence of air produces:/2015 RS)

Q. If the enthalpy of hydrogenation of cyclohexene and benzene are –x kJ mol–1 and –y kJ mol–1 respectively then resonance energy of benzene will be 2x – y y – x y – 3x x – y

Q.

Benzene diazonium chloride on reaction with KCN in the presence of CuCN yields X. X on hydrolysis gives Y. Y can also be obtained from

1. Toulene by the action of Cl₂/ FeCl₃

2. Toulene by the oxidation by KMnO₄

3. Toulene by nitration

4. Toulene by sulphonation