Question

Which of the following species is least stable?

• A. $P-O_{2} N-C_{6} H_{4}-{ }^{+} C H_{2}$
• B. $C _{6} H _{5}-{ }^{+} CH _{2}$
• C. $P-C l-C_{6} H_{4}-{ }^{+} C H_{2}$
• D. $P - CH _{3} O - C _{6} H _{4}-{ }^{+} CH _{2}$

Answer 1

Answer: (A)

$P-N O_{2}-C_{6} H_{4}-\overset{+}{C} H_{2}$ is the least stable carbocation among these because electron withdrawing $ -NO_{2} $ group destabilizes the carbocation.