Practice paper · Kolkata region

On addition of small amount of KMnO₄ to concentrated H₂SO₄, a green oily compound is obtained which is highly explosive in nature. Identify the compound from the following: -

1. AMn₂O₇
2. BMnO₂
3. CMnSO₄
4. DMn₂O₃.

Among the following alkenes which one produces tertiary butyl alcohol on acid hydration?

1. ACH₃ – CH = CH₂
2. BCH₃ – CH = CH – CH₃
3. CCH₃ – CH₂ – CH = CH₂
4. D(CH₃)₂C = CH₂

K₂Cr₂O₇ is preferred to Na₂Cr₂O₇ for the use in volumetric analysis as a primary standard solution because

1. ANa₂Cr₂O₇ is hygroscopic while K₂Cr₂O₇ is not.
2. BK₂Cr₂O₇ is hygroscopic but Na₂Cr₂O₇ is not.
3. CK₂Cr₂O₇ is pure while Na₂Cr₂O₇ is impure.
4. DNa₂Cr₂O₇ is unstable & does not form.

Which of the following reagent cannot be used to oxidise primary alcohols to aldehydes?

1. ACrO₃ in anhydrous medium.
2. BPyridinium chloro chromate
3. CKMnO₄ in acidic medium.
4. DHeat in presence of Cu at 573 K.

Hoffmann bromide degradation reaction is shown by ………...in presence of…………….

1. AAr-NH₂, CHCl₃ / alc.KOH
2. BAr-CONH₂, Br₂ / alc. NaOH
3. CAr-NO₂, Br₂ / alc. NaOH
4. DAr-CONH, CHCl₃ / alc. NaOH.

Which among the following is a false statement?

1. ARate of a zero-order reaction is independent of initial concentration of reactant.
2. BHalf-life of zero order reaction is inversely proportional to initial concentration of the reactant.
3. CMolecularity of a reaction may be zero or fraction.
4. DFor a first order reaction, half-life is independent of initial concentration of reactants.