An incorrect statement with respect to SN1 and SN2 mechanisms for

Subject

Chemistry

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

51.

When CH2=CH-O-CH2-CH3 reacts with one mole of HI, one of the products formed is

  • ethane

  • ethanol

  • iodoethene

  • ethanal


52.

0.44 g of a monohydric alcohol when added to methylmagnesium iodide in ether liberates at STP, 112 cm3 of methane. With PCC the same alcohol forms a carbonyl compound that answers silver mirror test. The monohydric alcohol is

  • H3C-CH(OH)-CH2-CH3

  • (CH3)3C-CH2OH

  • H3C-CH(OH)-CH2-CH2-CH3

  • (CH3)2CH-CH2OH


53.

Y is 


54.

Acetophenone cannot be prepared easily starting from

  • C6H5CH(OH)CH3

  • C6H5CH3

  • C6H5C≡CH

  • C6H6


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55.

An incorrect statement with respect to SN1 and SN2 mechanisms for alkyl halide is

  • A strong nucleophile in an aprotic solvent increases the rate or favours SN2 reaction.

  • Competing reaction for an SN2 reaction is rearrangement.

  • SN1 reactions can be catalysed by some Lewis acids.

  • A weak nucleophile and a protic solvent increases the rate or favours SN1 reaction.


B.

Competing reaction for an SN2 reaction is rearrangement.

Among the given statements, statement b is the incorrect one.

During SN2 reaction of alkyl halide, inversion of configuration takes place instead of rearrangement. While SN1 reaction occurs through the formation of carbocation intermediate which is favoured by the presence of lewis acid and aprotic solvent. Rearrangement is also possible as

CH3X + KOH (aq) → CH3OH + KX 


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56.

Butylated hydroxyl toluene as a food additive acts as

  • antioxidant

  • flavouring agent

  • colouring agnet

  • emulsifier


57.

'Terylene is not a

  • copolymer

  • polyester fibre

  • chain growth polymer

  • step growth polymer


58.

Iodoform reaction is answered by all, except

  • CH3-CH(OH)-CH2-COOH

  • CH3CHO

  • CH3-CH2-OH

  • CH3-CH2-CH2OH


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59.

C6H5COOH (ii)(i)NH3 P NaOBr Q (ii) Heat at 460 K(i)Conc. H2SO4 R

R is

  • o-bromo sulphanilic acid

  • sulphanilamide

  • sulphanilic acid

  • p-bromo sulphanilamide


60.

The statement that is not correct is

  • Aldose or ketose sugars in alkailne medium do not isomerise

  • Carbohydrates are optically active

  • Pentaacetate of glucose does not react with hydroxylamine

  • Lactose has glycosidc linkage between C4 of glucose and C1 of galactose unit.


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