21.

CH₃Br + Nu^- → CH₃ -Nu +Br-
The decreasing order of the rate of the above reaction with nucleophiles (Nu–) A to D is
[Nu–=
(A) PhO^–
(B) AcO^–
(C) HO^–
(D) CH3O^–
]

• D > C > A > B

• D > C > B > A

• A > B > C > D

• A > B > C > D

The increasing order of stability of the following free radicals is

Total volume of atoms present in a face-centre cubic unit cell of a metal is (r is atomic radius)

• 20πr³/3

• 24πr³/3

• 12πr³/3

• 12πr³/3

A reaction was found to be second order with respect to the concentration of carbon monoxide. If the concentration of carbon monoxide is doubled, with everything else kept the same, the rate of reaction will

• remain unchanged

• triple

• increase by a factor of 4

• increase by a factor of 4

The IUPAC name for the complex [Co(NO₂)(NH₃)₅]Cl₂ is

• nitrito-N-pentaamminecobalt (III) chloride

• nitrito-N-pentaamminecobalt (II) chloride

• pentaammine nitrito-N-cobalt (II) chloride

• pentaammine nitrito-N-cobalt (II) chloride

In the transformation of  , if one emission is an α-particle, what should be the other emission(s)?

• Two β^–

• Two β^– and one β⁺

• One β^– and one γ

• One β^– and one γ

A metal, M forms chlorides in it's +2 and +4 oxidation states. Which of the following statements about these chlorides is correct?

• MCl₂ is more volatile than MCl₄

• MCl₂ is more soluble in anhydrous ethanol than MCl₄

• MCl₂ is more ionic than MCl₄

• MCl₂ is more ionic than MCl₄

Which of the following statements is true?

• H₃PO₃ is a stronger acid than H₂SO₃

• In aqueous medium HF is a stronger acid than HCl

• HClO₄ is a weaker acid than HClO₃

• HClO₄ is a weaker acid than HClO₃

The molar conductivities ∧^oNaOAc and ∧^o HCl at infinite dilution in water at 25^o C are 91.0 and 426.2 S cm² /mol respectively. To calculate ∧^o HOAc, the additional value required is

• ∧^oH₂O

• ∧^oKCl

• ∧^oNaOH

• ∧^oNaOH

What products are expected from the disproportionation reaction of hypochlorous acid?

• HClO₃ and Cl₂O 

• HClO₂ and HClO₄

• HCl and Cl₂O

• HCl and Cl₂O