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JEE Main levelSingle correct optionDifficulty 2 of 3hc171

Use the relative rates of hydrogen abstraction by chlorine radical, primary : secondary : tertiary = 1 : 3.8 : 5. The percentage of 2-chloropropane in the monochlorination product of propane is nearest to:

A44.1\%
B55.9\%
C75.0\%
D25.0\%

Answer: B

Propane has 6 primary and 2 secondary H. Weighted reactivity: primary

6 \times 1 = 6

, secondary

2 \times 3.8 = 7.6

. Fraction of 2-chloropropane

= 7.6/13.6 = 55.9%

.

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