Organic Chemistry – Some Basic Principles and Techniques

Organic Chemistry – Some Basic Principles and Techniques

Question

Which branched chain isomer of the hydrocarbon with molecular mass 72u gives only one isomer of mono substituted alkyl halide?

  • Tertiary butyl chloride

  • Neopentane

  • Isohexane

  • Neohexane

Answer

B.

Neopentane

CnH2n+2 = 12n+ (2n+2)
n=5
Thus, hydrocarbon is C5H12

Since it gives only single C5H11Cl, thus C5H12 is symmetrical. It is neo pentane.

Molar mass = 72

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