Multiple Choice QuestionsOrder of boiling point is :
HF > HI > HBr > HCl
HF > HBr > HI > HCl
HCl > HBr > HI > HF
HCl > HI > HBr > HF
Assertion : Chloral reacts with phenyl chloride to form DDT.
Reason : It is an electrophilic substitution reaction.
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.
Assertion : Mixture of CH3COOH and CH3COONH4 is an example of acidic buffer.
Reason : Acidic buffer contains equimolar mixture of weak acid and its salt with weak base.
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.
Assertion : Alkyl iodide can be prepared by treating alkyl chloride/bromide with NaI in acetone.
Reason : NaCl/NaBr are soluble in acetone while NaI is not.
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.
C.
If assertion is true but reason is false.
This is Finkelstein reaction which involves the conversion of an alkyl chloride/bromide to an alkyl iodide by the addition of sodium iodide in acetone. Because sodium iodide is soluble in acetone and NaCl and NaBr are not. the equilibrium is shifted by the precipitation of insoluble salt.
R - X R - X'
The equilibrium position of the reaction depends on the nucleophilicity of the anion, whether a good leaving group is present and whether one anion is better stabilised than the other in a given solvent.
SN2 mechanism is involed in the following substitution :
CH3-CH2-Cl + OH-
(CH3)2-C(Cl)-CH3-OH-
(CH3)2-C-Cl + OH-
CH3-CH2-(CH3)C(Cl)-CH3 + OH-
Arrange the hydra - acids of halogens in increasing order of acidity .
HF < HCl < HBr < HI
HI < HBr < HCl < HF
HF < HBr < HI <HCl
HF < HI < HBr < HCl
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