Question

$C{H}_3-C{H}_3$ $C{D}_3-C{D}_3$ $C{H}_3-\stackrel{C{H}_3}{\stackrel{|}{\underset{C{H}_3}{\underset{|}{C}}}-}C{H}_3$

(I) (II) (III)

Correct order of rate of photochlorination for following compounds is :

• A. II < I < III
• B. I < II < III
• C. III < I < II
• D. II < III < I

Answer 1

The correct option is A II < I < III

Photochlorination depends upon bond strength of C-H bond, as C-D bond is stronger than C-H so its reactivity will be least. and compound III has highest reactivity due to formation of stable intermediate.