The formula for mustard gas is:
Correct answer: D. (C2H4Cl)2S
- A. (C2H2Cl2)2S
- B. (C2H4Cl2)2S
- C. (C2H3Cl2)2S
- D. (C2H4Cl)2S
Explanation
The correct formula for mustard gas is (C2H4Cl)2S. Mustard gas is a sulfur mustard with each carbon chain containing one chlorine atom, which is characteristic of its chemical structure. Option A is incorrect because it has two chlorine atoms per carbon, which is not the case for mustard gas. Option B is also incorrect as it suggests two chlorine atoms per carbon chain, unlike mustard gas. Option C is wrong because it indicates three hydrogen atoms per carbon, differing from the actual chemical structure of mustard gas.
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About Nomenclature, Structure and Reactivity
Alkyl halides are named by selecting the longest carbon chain and locating the halogen substituent, while their structures are classified as primary, secondary or tertiary. Their reactivity includes nucleophilic substitution and elimination, with the behaviour of leaving groups and the distinction between SN1 and SN2 mechanisms linked to substrate structure.
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