# Chemistry Class 12 NCERT Solutions: Chapter 10 Haloalkanes and Haloarenes Part 10 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Q: 16. Arrange the compounds of each set in order of reactivity towards displacement:

(i)

(ii)

(iii)

(i)

An reaction involves the approaching of the nucleophile to the carbon atom to which the leaving group is attached. When the nucleophile is sterically hindered, then the reactivity towards displacement decreases. Due to the presence of substituents, hindrance to the approaching nucleophile increases in the following order.

Hence, the increasing order of reactivity towards displacement is:

(ii)

Since steric hindrance in alkyl halides increases in the order of , the

increasing order of reactivity towards displacement is .

Hence, the given set of compounds can be arranged in the increasing order of their reactivity towards displacement as:

(iii)

The steric hindrance to the nucleophile in the mechanism increases with a decrease in the distance of the substituents from the atom containing the leaving group. Further, the steric hindrance increases with an increase in the number of substituents. Therefore, the increasing order of steric hindrances in the given compounds is as below:

Hence, the increasing order of reactivity of the given compounds towards displacement is:

Q: 17. Out of and , which is more easily hydrolysed by aqueous ?