In this English spelling question, four words are given and you must select the one that is incorrectly spelt according to standard English usage.

Introduction / Context:
This is another spelling recognition question in which you are asked to identify the one incorrectly spelt word out of four options. Such questions are common in competitive examinations to test your eye for detail and your familiarity with frequently used English words. Here, you must apply your knowledge of standard spellings used in everyday writing and formal communication.

Given Data / Assumptions:
- The four words are "Etiquete", "Exquisite", "Restaurant", and "Scavenger".
- Exactly one option contains a spelling error.
- All words are standard English terms relating to manners, beauty, food, and cleaning or collecting, respectively.

Concept / Approach:
The correct spelling of the word relating to proper manners and social behaviour is "Etiquette", with a double "t" before the final "e". The other words, "Exquisite", "Restaurant", and "Scavenger", are common and correctly spelt. When solving spelling questions, recall how these words appear in books, signboards, and formal documents, and pay close attention to the presence or absence of double letters.

Step-by-Step Solution:
Step 1: Examine "Etiquete". It is missing one "t" before the final "e". The correct spelling is "Etiquette". Step 2: Examine "Exquisite". This spelling is correct for the word meaning extremely beautiful or delicate. Step 3: Examine "Restaurant". This is also correctly spelt and refers to a place where people eat meals outside home. Step 4: Examine "Scavenger". This is correctly spelt and refers to an animal or person that collects or feeds on waste.

Verification / Alternative check:
A quick reference to any reliable dictionary will confirm that "Etiquette" is the accepted spelling, while "Etiquete" is not listed as a standard variant. The presence of the double "t" is essential in the correct form. Meanwhile, the other three words exactly match their dictionary spellings. As a result, "Etiquete" stands out as the only incorrect spelling among the given options.

Why Other Options Are Wrong:
"Exquisite" is wrong as an answer choice because it is already correct, expressing the idea of special beauty or delicacy. "Restaurant" is also correct and is widely used in both spoken and written English. "Scavenger" is correct and accurately describes a creature or person that gathers discarded material. Since none of these contain an error, they cannot be selected as the incorrectly spelt word.

Common Pitfalls:
Many test takers struggle with foreign derived words like "Restaurant" or refined vocabulary like "Exquisite", and may suspect them to be misspelt. However, exam setters often place the error in a simpler but less frequently written word, such as "Etiquette". To avoid confusion, practise writing down tricky words and reviewing their spellings regularly. Seeing them in context, for example in articles about social manners, also helps fix them in memory.

Final Answer:
The incorrectly spelt word in this question is Etiquete, which should be correctly written as "Etiquette".