Question

In which of the following reactions is a carbocation rearrangement possible?

• A. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HCl,0^{\circ }C}{\to }$
• B. $(C{H}_3{)}_{2}CH-CH=C{H}_2\stackrel{HBr,0^{\circ }C}{\to }$
• C. $Ph-C{H}_2-CH=C{H}_2\stackrel{HBr}{\to }$
• D. All of these

Answer 1

The correct option is D All of these

But since, there is a $3^0$ carbon just next to carbon bearing +ve charge
$\therefore$ Rearrangement is possible.
In the exactly similar manner.
This also shows charge rearragement to form.
$\therefore$Charge rearragement is possible in all three.
(d) is correct option.