The shape of a carbonium ion (carbocation) is:

The correct order of stability of the following carbocations is:

Arrange the following carbocations in decreasing order of stability.

The stability of the following carbanions is in the order of:

What is the shape of the methyl carbocation,$\overset{\oplus}{C}H_3$?

Which of the following are secondary radicals?
$(1) \ CH_3 - \dot{C}H - C_2H_5$
$(2) \ CH_2 = \dot{C} - CH_3$
$(3) \ CH_2 = CH - \dot{C}H_2$
$(4) \ (CH_3)_2 \dot{C}H$