Nucleophilic Addition at the Carbonyl

Q.

Which of the following reagents can be used to distinguish between Phenol and Benzyl alcohol?

1. Bromine in Carbon tetrachloride

2. Ferric chloride

3. Sodium hydroxide

4. Sodium bicarbonate

Q. Chlorobenzene reacts with Mg in dry ether to give a compound A which further reacts with ethanol to yield Phenol Benzene Ethyl benzene phenyl

Q. what will the ph of a so\ln formed by mixing 40ml, 0.1M HCl with 10ml, 0.45M NaOH

Q. For preparing a buffer of pH 6 by mixing sodium acetate and acetic acid the ratio of the concentration of salt and acid should be ( Ka=10^-5)

Q. 8. Out of HCN & CH3OH Which will show tautomerism?Why and why not?

Q. find the pH of 0.5M HF(ka =2\ast10^{-4}) 4 2 3 2.

Q. 10 ml of 0.1 M weak base BOH with K_b of 10^{-12} is titrated with 0.025 M HCl. The pH at equivalence point is (K_w=10^{-14})

Q. pH of solution made by mixing 200 mL of 0.1 M CH3COOH and 100 mL of 0.1 M NaOH is

Q. 17. The pH of 0.2 M monobasic acid is 3.5 then Ka is

Q. At 90degree celsius , the pH of 0.001M KOH solution will be 1.3 2.11 3.5 4.9

Q. 30.pH of a mixture which contain 0.1 M in CH3COOH and 0.05 M in (CH3COO)2Ba is [pKa of CH3COOH = 4.74] a) 4.74 b) 5.04 c) 4.44 d) 7.00

Q. 30. The ph of a solution is increased from 3 to 6 , its H+ concentration will be (a) reduced to half B). Doubled C) reduced by 1000 times D) increased by 1000 times

Q. The correct order of reactivity of PhMgBr with

1. I > II > III
2. III > II > I
3. II > III > I
4. I > III > II

Q. 9. Find pH of C6H5ONa whose Ka is 10 power minus 10 and concentration is 0.1M ??

Q.

Which among the following is a Lewis acid?

1. NaCl

2. BF₃

3. NaF

4. MgCl₂

Q. 70 The pH of 0.005M codeine (C18H21NO3) solution is 9.95. Its pkb value is A 8.92 B 5.81 C 3.76 D 4.29

Q. 28.The pH of solution formed by mixing 40 ml of 0.10 M HCl and 10 ml of 0.45 of NaOH is ?

Q. 46. Find pH of solution formed by mixing 50ml of 0.1M NH3 and 10ml of 0.1M HCl. Assume pkb of NH3 to be x

Q. 2. 20ml of 0.2M HCN is mixed with 10ml of 0.2M NaOH then tH is? (tKa of HCN is 5)

Q. 36. in which case pH will not change on dilution upto 100 times (1)0.01 M ch3coona + 0.01 Mch3cooh (2)0.01 M CH3COONH4 (3)0.01M NH4CN (4)all of the above

Q. Assuming complete ionization, same moles ofwhich of the following compounds will require the least amount of acidified KMnO4 for complete oxidation? (1) FeC2O4 (2) Fe(NO2)2 (3) FeSO4 (4) FeSO3

Q. 16. What is the pH of 10^{-8} M of dilute HCl

Q. pH of 10^-7 M HClO4

Q. 47. What is the difference in the pH of 1/3 and 2/3 stages of neutralization of 0.1 M CH3COOH and 0.1 M NaOH

Q. At 25°C, 100 ml 0.1 M HCl and 50 ml 0.2 M NaOH was mixed. pH of the mixture will be 6 7 8 10

Q. 10 g of Mno2 on reaction with HCI forms 2.24 L of Cl2(g) at NTP, the percentage impurity of MnO2 is (1) (3) 87% (2) 25% (4) 13% 33.3%

Q. A weak base BOH is titrated with a strong acid HA.When 10 mL of HA is added, pH is found to be9.00 and when 25 mL is added, pH is 8.00. Thevolume of the acid required to reach the equivalencepoint is(a) 55 mL (b) 40 mL (c) 30 mL (d) 50 mL

Q. what volume of 0.1M HCOONa should be added to 50ml of 0.05M HCOOH to produce a buffer of pH=4 if p^Ka=3.7

Q. Q 2/14 Which of the following willl decrease the pH of50 mL solution of 0.01 M HCI? 1.Addition of 5 mL of 1 M HCI 2.Addition of 50 mL of 0.01 M HCI 3.Addition of 50 mL of 0.002 M HCl 4Addition of Mg

Q. the pH of a solution by mixing 100ml of 0.2 M CH3COOH with 100ml of 0.2 M NaOH will be(pKa for CH3COOH=4.74 and \log2=0.301