Arrange the given words in dictionary order (A→Z). Words: (i) Chemistry, (ii) Chamber, (iii) Cheap, (iv) Cheerful.

Introduction / Context:
Dictionary order resolves ties letter by letter. All four words share the prefix “Ch…”. We must compare subsequent letters carefully to prevent swapping neighbors incorrectly.

Given Data / Assumptions:

• Words: Chamber, Cheap, Cheerful, Chemistry.
• Compare case-insensitively.

Concept / Approach:
After “Ch…”, evaluate the next letters: “Chamb…”, “Chea…”, “Chee…”, “Chem…”. Among “Che…”, the second vowel decides: “a” < “e” < “m”. “Chamber” (with “cha…”) precedes all “che…” words.

Step-by-Step Solution:
Order: (ii) Chamber → (iii) Cheap → (iv) Cheerful → (i) Chemistry.Within “che…”, “chea…” precedes “chee…”, which precedes “chem…”.

Verification / Alternative check:
Check adjacent pairs: Chamber<Cheap<Cheerful<Chemistry holds under standard lexicographic comparison.

Why Other Options Are Wrong:
They invert at least one neighbor pair (e.g., placing Chemistry before Cheerful).

Common Pitfalls:

• Letting word length override earlier letter differences; earlier differing letters always dominate.

Final Answer:
(ii), (iii), (iv), (i).