Question

Which of the following reactions is not exothermic ?
A. `CH_(3)-CI+CH_(3)-CH_(3)rarrCH_(4)+CH_(3)-CH_(2-CI`
B. `CH_(3)-CI+(CH_(3))_(3)C-HrarrCH_(4)+(CH_(3))_(3)C-CI`
C. `CH_(3)-CI+CH_(2)=CH-CH_(3)rarrCH_(4)+CH_(2)=CH-CH_(2)-CI`
D. `CH_(3)-CI+CH_(2)=CH_(2)rarrCH_(4)+CH_(2)=CHCI`

Answer 1

Correct Answer - D
`{:(H_(2)=CH-HrarrH_(2)C=overset(*)CH),(" "uarr" " "unstable vinyl radical"),("string bond"):}`
thereofore it is endothermic .