CH3CH2OH →Step- 1Cl2 CH3CHO →Step-2

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

21.

Which of the following reactions does not liberate gaseous product ?

  • AlCl3 + NaOH →

  • NaOH + P(white) + H2O →

  • Al + NaOH 

  • Zn + NaOH 


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22.

CH3CH2OH Step- 1Cl2 CH3CHO Step-23Cl2 Cl3CCHO

In the above reaction, the role of Cl2 in Step-1 and Step-2 respectively is:

  • oxidation, chlorination

  • reduction, chlorination

  • oxidation, addition

  • reduction,substitution


A.

oxidation, chlorination

CH3CH2OH Step - 1Cl2 CH3CHO

The above reaction is an example of oxidation. Due to oxidation -CH2OH group is oxidised to -CHO group.

CH3CHO Step - 23Cl2 Cl3 C.CHO

In the second step chlorination takes palce. In chlorination hydrogen atom changes by chlorine.


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23.

The number of sigma (σ) and pi (π) bonds present in benzene respectively are :

  • 12, 6

  • 6, 6

  • 6, 12

  • 12, 3


24.

The standard reduction potentials of Zn2+| Zn, Cu2+| Cu and Ag+| Ag are respectively -0.76, 0.34 and 0.8 V. The following cells were constructed :

(1) Zn | Zn2+ || Cu2+ | Cu

(2) Zn | Zn2+ || Ag+ | Ag

(3) Cu | Cu2+ || Ag+ |Ag

What is the correct order of Ecell° of these cells?

  • 2 > 3 > 1

  • 2 > 1 > 3

  • 1 > 2 > 3

  • 3 > 1 > 2


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25.

What is the time (in sec) required for depositing all the silver present in 125 mL of 1 M AgNO3 solution by passing a current of 241.25 A? (1F = 96500 coulombs)

  • 10

  • 50

  • 1000

  • 100


26.

The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :

  • solid, solid, lyophobic

  • liquid, liquid, lyophobic

  • solid, liquid, lyophobic

  • solid, liquid, lyophilic


27.

Electrolysis of X gives Y at anode. Vacuum distillation of Y gives H2O. The number of peroxy (O-O) bonds present in X and Y respectively are :

  • 1, 1

  • 1, 2

  • zero, 1

  • zero, zero


28.

AB is an ionic solid. The ionic radii of A+ and B- are respectively rc and ra. Lattice energy of AB is proportional to :

  • rcra

  • (rc + ra)

  • rarc

  • 1rc + ra


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29.

The rate constant of a first order reaction at 27°C is 10-3 min-1. The temperature coefficient of this reaction is 2. What is the rate constant (in min-1 ) at 17°C for this reaction ?

  • 10-3

  • 5 × 10-4

  • 2 × 10-3

  • 10-2


30.

What is the correct order of occurrence (% by weight) in air of Ne, Ar and Kr ?

  • Ne > Ar > Kr

  • Ar > Ne > Kr

  • Ar > Kr > Ne

  • Ne > Kr > Ar


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