Assertion: o-Nitrophenol is more volatile than p-nitrophenol.Reas

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 Multiple Choice QuestionsMultiple Choice Questions

431.

Phenol reacts with aqueous bromine to give :

  •  + 


432.

Assertion : t-Butyl methyl ether is not prepared by the reaction of t-butyl bromide with sodium methoxide.

Reason : Sodium methoxide is a strong nucleophile.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


433.

Among the following the most reactive towards alcoholic KOH is

  • CH2=CHBr

  • CH3COCH2CH2Br

  • CH3CH2Br

  • CH3CH2CH2Br


434.

Propan-1-ol can be prepared from propene by

  • H2O/H2SO4

  • Hg(OAc)2/H2O followed by NaBH4

  • B2H6 followed by H2O2

  • CH3CO2H/H2SO4


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435.

Assertion : Molar entropy of vaporisation of water is different from ethanol.

Reason : Water is more polar than ethanol.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion

  • If assertion is true but reason is false

  • If both assertion and reason are false.


436.

The product of the given reacion is


437.

In the reaction,

R MgBr + HC(OEt)3 Ether, H3O+ P, the product P is

  • RCHO

  • R2CHOEt

  • R3CH

  • RCH(OEt)2


438.

Which of the following statements is not true about alcohols?

  • Lower alochols have fiery taste and strong smell.

  • As molecular mass increases the boiling point increases.

  • Lower alcohols are water insoluble and their solubility increases with molecular weight.

  • Lower alcohols are water soluble and their solubility decreases with molecular weight.


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439.

Assertion: o-Nitrophenol is more volatile than p-nitrophenol.

Reason : Intramolecular hydrogen bonding is present in o-nitrophenol while intermolecular H - bonding is in p-nitrophenol.

  • If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

  • If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.

  • If Assertion is true but Reason is false.

  • If Assertion is false but Reason is true.


A.

If both Assertion and Reason are true and Reason is the correct explanation of Assertion.

p-Nitrophenol has higher boiling point than o-nitrophenol, because intermolecular hydrogen bonding present in p-nitrophenol is responsible for it. But intramolecular hydrogen bonding in o-nitrophenol does not effect boiling point.


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440.

Assertion: Phenol is a weaker acid than ethanol.
Reason: Groups with +M effect and -I effect decrease acidity at m-position.

  • If both assertion and reason are true and reason is a correct explanation of the assertion.

  • If both the assertion and reason are true but the reason is not a correct explanation of the assertion.

  • If the assertion is true but the reason is false.

  • If both the assertion and reason are false.


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