JEE 2020 Chemistry: Hydrocarbons and their substituents-03(02.09.2019)

Arrange

(I)

(II)

(III)

(IV)

In increasing order of reactivity in S_N1 reations

The order of reactivity of S_N2 reactions shown by isomers of chlorobutane is

Identify the set of reagents/reaction conditions ‘X’ and ‘Y’ in the following set of transformations

Toluene when treated with Br₂/Fe, gives p-bromotoluene as the major product because the methyl group

1) is para-directing

2) is m-directing

3) activates the ring by hyperconjugation

4) deactivates the ring

The product in the reaction 

is

The correct order of rate of S_N2 reactivity of H₂O, ^–OCH₃, OH^– and CH₃COO^–

Alkyl halides can be converted to ethers through

1-Chlorobutane on reaction with alcoholic potash gives

A dihalogen derivative ‘X’ of a hydrocarbon with three carbon atoms in a molecule, reacts with alc. KOH giving another hydrocarbon which gives red precipitate with amm. CuCl. ‘X’ gives an aldehyde when treated with aqueous KOH. The compound ‘X’ is

1-Bromopropane on reaction with LiAIH₄ yields