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Complete the following statements by selecting the correct alternative from the choices given: (i)…
Complete the following statements by selecting the correct alternative from the choices given:
(i) During the course of an $\text{S}_\text{N}1$ reaction, the intermediate species formed is:
(1) a carbocation
(2) a free radical
(3) a carbanion
(4) an intermediate complex
(ii) Purification of aluminium by electrolytic refining is called:
(1) Serpeck’s process
(2) Hoope’s process
(3) Hall’s process
(4) Baeyer’s process
(iii) An aqueous solution of urea freezes at $-0\cdot186^\circ\text{C}$, $K_f$ for water = $1\cdot86\text{ K kg mol}^{-1}$, $K_b$ for water = $0\cdot512\text{ K kg mol}^{-1}$. The boiling point of urea solution will be:
(1) $373\cdot065\text{ K}$
(2) $373\cdot186\text{ K}$
(3) $373\cdot512\text{ K}$
(4) $373\cdot0512\text{ K}$
(iv) In the dehydration of alcohols to alkenes by heating with concentrated sulphuric acid, the initiation step is:
(1) formation of carbocation
(2) formation of an ester
(3) protonation of alcohol molecule
(4) elimination of water
Answer
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From ISC 2018 Chemistry Paper 1, question 1(b).