Identify A and B in the following reactions  from Chemistry

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

1.

The quantum number which explains the line spectra observed as doublets in case of hydrogen and alkali metals and doublets and triplets in case of alkaline earth metals is

  • spin

  • azimuthal

  • magnetic

  • principal


2.

The formal charges of C and O atoms in CO2 ( :Ö= C=:Ö) are respectively

  • 1, -1

  • -1,1

  • 2,-2

  • 0,0


3.

According to molecular orbital theory, the total number of bonding electron pairs in O2 is

  • 2

  • 3

  • 5

  • 4


4.

Which one of the following equations represents the variation of viscosity coefficient (η) with temperature (T)?

  • η= Ae-E/RT

  • η= AeE/RT

  • η= Ae-E/kT

  • η= Ae-E/T


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5.

The number of moles of electrons required to deposit 36 g of Al from an aqueous solution of Al(NO3)3 is (At. wt. of Al = 27)

  • 4

  • 3

  • 2

  • 1


6.

Which one of the following statements is not correct?

  • The pH of 1.0 ×10-8 M HCl is less than 7.

  • The ionic product of water at 25°C is 1.0 ×10-14 mol2L-2

  • Cl- is a Lewis acid

  • Bronsted Lowry theory cannot explain the acidic character of AlCl3.


7.

Molar heat capacity (Cp) of water at constant pressure is 75 JK-1mol-1. The increase in temperature (in K) of 100 g of water when 1 kJ of heat is supplied to it is

  • 2.4

  • 0.24

  • 1.3

  • 0.13


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8.

Identify A and B in the following reactions

 


C.

NO2 being meta directing gives m-chloronitrobenzene, when treated with Cl2, Fe.

                

On reduction with LiAlH4, nitrobenzene gives azobenzene.

        


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9.

With respect to chlorobenzene, which of the following statements is not correct ?

  • Cl is ortho/para directing

  • Cl exhibits + M effect

  • Cl is ring deactivating

  • Cl is meta directing


10.

Match the following.
  Column I   Column II
A. Acetaldehyde,vinyl alcohol 1. Enantiomers
B. Eclipsed and staggered ethane 2. Tautomers
C. (+)2-butanol,(-)2-butanol 3. Chain isomers
D. Methyl-n-propyl-amine and diethylamine 4. Conformational isomers
    5. Metamers

  • A B C D

    1 4 3 5

  • A B C D

    2 4 1 5

  • A B C D 

    5 1 4 2

  • A B C D

    5 1 3 2


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