What is meant by the chirality of a compound?

(i) Chirality is the property of a molecule to have non-super-imposable mirror images. These molecules contain one asymmetric carbon atom. e.g., Butan-2-ol
(ii) CH3CH(Cl)CH2CH3 is more easily hydrolyzed due to the formation of a more stable secondary carbocation.
(iii) CH3CH2CH2CH2CH2I undergoes SN2 substitution reaction faster because I⁻ is a better leaving group due to its large size.