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Q.
$\ce{CH3 -CH = CH2 ->[500^{\circ}C][Cl_2]}X. X$ is
UP CPMTUP CPMT 2010
Solution:
The alkyl group of the alkenes undergo substitution at high temperature. Chlorine or bromine replace hydrogen of the alpha carbon atom with respect to the double bond of alkyl group at about $500^{\circ}C$ without breaking the double bond (allylic substitution)