Question

$2$-Methylpropane on monochlorination under photochemical condition give

• A. $2$-Chloro-$2$-methylpropane as major product
• B. $(1:1)$ Mixture of $1$-chloro-$2$-methylpropane and $2$-chloro-$2$-methylpropane
• C. 1-Chloro-2-methylpropane as a major product
• D. (1:9) Mixture of 1-chloro-2-methylpropane and 2-chloro-2-methylpropane

Answer 1

Answer: (C)

There are nine primary hydrogens and one tertiary hydrogen in 2-methyl propane. Tertiary hydrogen atoms react with Cl about $5.5$ times as fast as primary. Even though the primary hydrogens are less reactive, there are so many of them that the primary product is the major product,