The geometry of the reaction intermediate in an $S_N1$ reaction is:

State True or False for the following statements:
$(i)$ $\mathop{C}\limits^{+}H_3$ and $CH_3\mathop{C}\limits^{+}H_2$ both are primary carbocations.
$(ii)$ $(CH_3)_3\mathop{C}\limits^{+}$ is a tertiary carbocation and all carbons are $sp^3$ hybridized.
$(iii)$ $\mathop{C}\limits^{+}H_3$ is trigonal planar.
$(iv)$ $CH_4$ is not trigonal planar.

For the following radicals,the correct order of their stability is

Which of the following is more stable than the remaining three?

The correct order of stability of the carbocations given below is:

Which of the following orders regarding relative stability of free radicals is correct?