In the reaction with HCl, an alkene reacts in accordance with th

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 Multiple Choice QuestionsMultiple Choice Questions

191.

In an SN1 reaction on chiral centres, there is 

  • 100% racemisation

  • inversion more than retention leading to partial racemization

  • 100% retention

  • 100% retention

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192.

The order of reactivity of phenyl magnesium bromide (phMgBr) with the following compounds.


  • III > II> I

  • II > I > III

  • I > III > II

  • I > III > II

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193.

The IUPAC name of the following compound

  • trans - 2- chloro - 3 - iodo - 2 - pentene

  • cis - 3- iodo - 4-  chloro - 3- pentene

  • trans - 3- iodo - 4- chloro - 3- pentene

  • trans - 3- iodo - 4- chloro - 3- pentene

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194.

Consider the reactions


space left parenthesis straight i right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CH minus space CH subscript 2 space minus space CH subscript 2 space Br space rightwards arrow with straight C subscript 2 straight O subscript 5 OH on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus space Br to the power of minus

left parenthesis ii right parenthesis space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 Br rightwards arrow with straight C subscript 2 straight H subscript 5 straight O to the power of minus on top space left parenthesis CH subscript 3 right parenthesis subscript 2 CHCH subscript 2 OC subscript 2 straight H subscript 5 space plus Br to the power of minus

The mechanisms of reactions (i) and (ii) are respectively

  • SN1 and SN2

  • SN1 and SN1

  • SN2 and SN2

  • SN2 and SN2

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195.

In the reaction with HCl, an alkene reacts in accordance with the markownikoff's rule, to give a product 1-chloro -1- methylcyclohexane. The possible alkane is 

  • (a) and (b)

  • (a) and (b)


C.

(a) and (b)

For structure A



For structure B,

There is a rearrangement of carbocation occur because 3o carbocation is more stable than 2o- carbocation.

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196.

2,3 -dimethyl - 2- butene can be prepared by heating which of the following compounds with a strong acid?

  • (CH3)2CH-CH(CH)3-CH=CH2

  • (CH3)3C-CH=CH2

  • (CH3)2C =CH-CH2-CH3

  • (CH3)2C =CH-CH2-CH3

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197.

Which one is most reactive towards SN1 reaction?

  • C6H5CH(C6H5)Br

  • C6H5CH(CH3)Br

  • C6H5C(CH3)(C6H5)Br

  • C6H5C(CH3)(C6H5)Br

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198.

In the following reaction, straight C subscript 6 straight H subscript 5 CH subscript 2 Br space rightwards arrow from 2. space straight H subscript 3 straight O to the power of plus to 1. space Mg comma space Ether of space straight X comma the product 'X' is

  • C6H5CH2OCH2C6H5

  • C6H5CH2OH

  • C6H5CH3

  • C6H5CH3

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199.

Which of the following reactions is an example of nucleophilic substitution reaction?

  • RX + KOH → ROH + KX

  • 2RX + 2Na → R- R 

  • RX + H2 → RH + HX

  • RX + H2 → RH + HX

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200.

Consider the following reaction,


ethanol space rightwards arrow with PBr subscript 3 on top space straight X space rightwards arrow with alc. space KOH on top space straight Y space rightwards arrow from left parenthesis ii right parenthesis space straight H subscript 2 straight O comma space heat to left parenthesis straight i right parenthesis space straight H subscript 2 SO subscript 4 of space straight Z semicolon
the product Z, is

  • CH2 = CH2

  • CH3CH2-O-CH2-CH3

  • CH3-CH2-O-SO3H

  • CH3-CH2-O-SO3H

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