The best and latest technique for isolation, purification and separation of organic compounds is:

(a) Crystallisation

(b) Distillation

(c) Sublimation

(d) Chromatography

In the organic compound CH₂ = CH – CH₂ – CH₂– C ≡ CH, the pair of hydridised orbitals involved in the formation of: C₂ – C₃ bond is:

(a) sp – sp₂ (b) sp – sp₃

(c) sp₂– sp₃ (d) sp₃ – sp₃

In the Lassaigne’s test for nitrogen in an organic compound, the Prussian blue colour is obtained due to the formation of:

(a) Na₄[Fe(CN)₆] (b) Fe₄[Fe(CN)₆]₃

(c) Fe₂[Fe(CN)₆] (d) Fe₃[Fe(CN)₆]₄

Which of the following carbocation is most stable?

(a)

(b)

(c)

(d)

The reaction:

CH₃CH₂I + KOH (aq) →CH₃CH₂OH + KI is classified as:

(a) electrophilic substitution

(b) nucleophilic substitution

(c) elimination

(d) addition