Isomers are molecules or polyatomic ions with identical molecular formula - that is, same number of atoms of each element - but distinct arrangements of atoms in space. Isomerism refers to the existence or possibility of isomers. Isomers do not necessarily share similar chemical or physical properties. Two main forms of isomerism are structural or constitutional isomerism, in which bonds between the atoms differ; and stereoisomerism or spatial isomerism, in which the bonds are the same but the relative positions of the atoms differ. How many chain isomers can an aliphatic saturated hydrocarbon with 7 carbons make?
Correct answer: D. 64
- A. 7
- B. 5
- C. 12
- D. 64
Explanation
An aliphatic saturated hydrocarbon with 7 carbons is a type of alkane, and its general formula can be represented as CₙH₂ₙ₊₂, where n is the number of carbon atoms. For an alkane with 7 carbons, the formula is C₇H₁₆. Now, let's consider the possibilities for chain isomerism in alkanes. In chain isomerism, the carbon atoms can be arranged in different ways. The number of chain isomers for an alkane with n carbon atoms can be determined using the formula 2n-1. For C₇H₁₆: Number of chain isomers = 27-1 = 26 = 64 So, the correct answer is 64.
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Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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