Which branched chain isomer of the hydrocarbon with molecular mass 72u...
Since we are getting monosubstituted alkyl halide so it is neopentane.
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Which branched chain isomer of the hydrocarbon with molecular mass 72u...
The hydrocarbon with molecular mass 72u has the formula C6H12, which can exist in different isomeric forms.
Explanation:
There are three possible branched chain isomers of C6H12: neohexane, isohexane, and neopentane.
- Isohexane: This isomer has a straight chain of four carbon atoms, with a methyl group attached to the second carbon atom. It can give two different monosubstituted alkyl halides, depending on which carbon atom is substituted. Therefore, option B is not correct.
- Neohexane: This isomer has a branched chain with a tertiary carbon atom (three other carbon atoms attached to it). It can give three different monosubstituted alkyl halides, depending on which carbon atom is substituted. Therefore, option C is not correct.
- Neopentane: This isomer has a branched chain with a quaternary carbon atom (four other carbon atoms attached to it). It can give only one monosubstituted alkyl halide because there is only one possible site for substitution. Therefore, option D is correct.
- Tertiary butyl chloride: This compound has a branched chain with a tertiary carbon atom and a chlorine atom attached to it. It is not an isomer of C6H12, so option A is not correct.
Therefore, the correct answer is option D, neopentane.