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Give reasons for the following:
(CH3)3C–O–CH3 on reaction with HI gives (CH3)3C–I and CH3–OH as the main products and not (CH3)3C–OH and CH3–I.
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Out of 
, which is more reactive towards SN1 reaction and why?
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
In the extraction of Al, impure Al2O3 is dissolved in conc. NaOH to form sodium aluminate and leaving impurities behind. What is the name of this process?
Concept: Occurrence of Metals
Which would undergo SN2 reaction faster in the following pair and why ?
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
Indicate the principle behind the method used for the refining of zinc.
Concept: Occurrence of Metals
Which form of the iron is the purest form of commercial iron?
Concept: Occurrence of Metals
Give reasons : n-Butyl bromide has higher boiling point than t-butyl bromide.
Concept: Physical Properties of Haloalkanes and Haloarenes
Give reasons : Racemic mixture is optically inactive.
Concept: Haloalkanes >> R-s and D-l Configuration
The presence of nitro group (−NO2) at o/p positions increases the reactivity of haloarenes towards nucleophilic substitution reactions.
Concept: Hydrocarbons: Alkanes >> Reactions of Haloarenes - Nucleophilic Substitution
What is the principle behind the zone refining of metals?
Concept: Refining of Crude Metals
Identify the chiral molecule in the following pair :
Concept: Haloalkanes >> R-s and D-l Configuration
Explain the principle of the method of electrolytic refining of metals. Give one example.
Concept: Refining of Crude Metals
Write the structures of A, B and C in the following:
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions
p-Dichlorobenzene has higher m.p. and lower solubility than those of o- and m-isomers. Discuss.
Concept: Physical Properties of Haloalkanes and Haloarenes
Give reasons:
The dipole moment of chlorobenzene is lower than that of cyclohexyl chloride.
Concept: Hydrocarbons: Alkanes >> Reactions of Haloarenes - Nucleophilic Substitution
Account for the following:
Helium is used in diving apparatus.
Concept: Group 18 Elements - The Noble gas Family
Draw the structures of the following molecules: XeF2
Concept: Group 18 Elements - The Noble gas Family
Draw the structures of the following: H4P2O7 (Pyrophosphoric acid)
Concept: Group 15 Elements - The Nitrogen Family >> Oxoacids of Phosphorus
What happens when
H3PO3 is heated ?
Write the reactions involved.
Concept: Group 15 Elements - The Nitrogen Family >> Phosphine
Write the mechanism of the following reaction:
Concept: Chemical Reactions of Alcohols and Phenols >> Reactions Involving Cleavage of Carbon–Oxygen (C–O) Bond in Alcohols
