Which of the following is more stable?

Which of the following is a more stable carbocation?

Which of the following is a more stable complex and why? [co(NH_3)_6]^(3+) and [Co(en)_3]^(3+)

Which of the following ions is more stable ?

Which of the following ions is more stable ?

Which of the following ions is more stable ?

'Stability of carbocations depends upon the electron releasing inductive effect of groups adjacent to positively charged atom involvement of neighbouring groups in hyperconjugation and resonace''. Which of the following ions is more stable ? Use resonance of explain your answer.

Which of the following alkene is more stable than