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 Multiple Choice QuestionsMultiple Choice Questions

11.

The epoxide ring consists of which of the following

  • three membered ring with two carbon and one oxygen

  • four membered ring with three carbon and one oxygen

  • five membered ring with four carbon and one oxygen

  • six membered ring with five carbon and one oxygen


A.

three membered ring with two carbon and one oxygen

The structural formula of epoxide is . It consists three membered ring with two carbon and one oxygen.


12.

The reaction of toluene with Cl2 in presence of FeCl3 gives predominantly

  • benzoyl chloride

  • benzyl chloride

  • o-and p-chlorotoluene

  • o-and p-chlorotoluene


C.

o-and p-chlorotoluene

Due to o- and p- directing nature of CH3 group. 

413 Views

13.

Trans esterification is the process of :

  • conversion of an aliphatic acid to ester

  • conversion of an aromatic acid to ester

  • conversion of one ester to another ester

  • conversion of an ester into its components namely acid and alcohol


C.

conversion of one ester to another ester

Transesterification is the process of conversion of one ester to another ester.

                        


14.
The alkene formed as a major product in the above elimination reaction is
  • CH2 = CH2


B.

CH2 = CH2

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15.

The electrophile involved in the above reaction is
  • dichloromethyl cation (C+HCl )

  • dichlorocarbene ( :CCl2

  • trichloromethyl anion (C-Cl3 )

  • trichloromethyl anion (C-Cl3 )


B.

dichlorocarbene ( :CCl2

225 Views

16.

In the Grignard reaction, which metal forms an organometallic bond?

  • Sodium

  • Titanium

  • Magnesium

  • Palladium


C.

Magnesium

In the Grignard reaction magnesium metal forms an organometallic bond.

RX + Mg Dryether R - Mg - XGrignard reagents


17.

Phenols are more acidic than alcohols because

  • phenoxide ion is stabilised by resonance

  • phenols are more soluble in polar solvents

  • phenoxides ions do not exhibit resonance

  • alcohols do not lose H atoms at all


A.

phenoxide ion is stabilised by resonance

Phenol is more acidic than alcohol because phenoxide ion is stabilised by resonance.

                           

                        Resonance structures of phenoxide ion of phenol 


18.

The structure of the compound that gives a tribromo derivative on treatment with bromine water is


A.

384 Views

19.

In the following sequence of reactions, 

CH subscript 3 CH subscript 2 OH space rightwards arrow with space space space straight P space plus space straight I subscript 2 on top straight A space rightwards arrow from ether to Mg of straight B space rightwards arrow with HCHO on top space straight C space rightwards arrow with straight H subscript 2 straight O on top space straight D comma space then compound ‘D’ is

  • butanal

  • n-butyl alcohol

  • n-propyl alcohol

  • n-propyl alcohol


C.

n-propyl alcohol

CH subscript 3 CH subscript 2 OH space rightwards arrow with straight P space plus space straight I subscript 2 on top space stack CH subscript 3 CH subscript 2 straight I with left parenthesis straight A right parenthesis below space rightwards arrow from dry space ether to Mg of space stack CH subscript 3 CH subscript 2 MgI with left parenthesis straight B right parenthesis below
rightwards arrow with HCHO on top space stack CH subscript 3 CH subscript 2 CH subscript 2 OMgI with left parenthesis straight C right parenthesis below space rightwards arrow with straight H subscript 2 straight O on top stack space CH subscript 3 CH subscript 2 CH subscript 2 OH with left parenthesis straight D right parenthesis below space plus space Mg left parenthesis OH right parenthesis straight I
therefore the compound D is n-propyl alcohol
204 Views

20.

Phenol is more acidic than :

  • p-chlorophenol

  • p-nitrophenol

  • o-nitrophenol

  • ethanol


D.

ethanol

Phenol is more acidic than ethanol due to resonance stabilisation of phenoxide ion.