MCQ
The most stable carbocation for the following is:


- ✓$c$
- B$d$
- C$b$
- D$a$


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$(A)$ $T _1= T _2$ $(B)$ $T _3> T _1$
$(C)$ $W _{\text {isothermal }} > W _{\text {adiabatic }}$ $(D)$ $\Delta U_{\text {isothermal }}>\Delta U_{\text {adiabatic }}$
$(1)$ $(CH_3)_3 {\bar{\ddot{C}}}$
$(2)$ ${(C{H_3})_2}{\bar {\ddot {CH}}}$
$(3) $ $C{H_3}{\bar{\ddot{C{H_2}}}}$
$(4)$ ${C_6}{H_5}{\bar{\ddot{C{H_2}}}}$ is