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Classification of Hydrocarbons

A hydrocarbon...

Question

A hydrocarbon X has molar mass 84, but contains no double or triple bonds. Also X has no methyl locant, so how many different IUPAC names can be asigned to X?

A

4

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B

3

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C

2

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D

6

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Solution

The correct option is A 4
Molar mass 84 is a multiple of 14 hence, X is based on general formula $C_{n} H_{2 n}$ with molar mass 14 n. Here, n is 6 and X is $C_{6} H_{12}$ . As X has no double bond and no methyl locant, it must be a cycloalkane. Cycloalkanes without methyl as locant are

Hence, the correct answer is option (a).

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Classification of Hydrocarbons

Standard XII Chemistry

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