231628
Among the following carbocations:
(I) $\mathrm{Ph}_{2} \mathrm{C}^{+} \mathrm{CH}_{2} \mathrm{Me}$
(II) $\mathrm{PhCH}_{2} \mathrm{CH}_{2} \mathrm{CH}^{+} \mathrm{Ph}$
(III) $\mathrm{Ph}_{2} \mathrm{CHCH}^{+} \mathrm{Me}$
(IV) $\mathrm{Ph}_{2} \mathrm{C}(\mathrm{Me}) \mathrm{CH}_{2}$ The order of stability is -
231628
Among the following carbocations:
(I) $\mathrm{Ph}_{2} \mathrm{C}^{+} \mathrm{CH}_{2} \mathrm{Me}$
(II) $\mathrm{PhCH}_{2} \mathrm{CH}_{2} \mathrm{CH}^{+} \mathrm{Ph}$
(III) $\mathrm{Ph}_{2} \mathrm{CHCH}^{+} \mathrm{Me}$
(IV) $\mathrm{Ph}_{2} \mathrm{C}(\mathrm{Me}) \mathrm{CH}_{2}$ The order of stability is -
231628
Among the following carbocations:
(I) $\mathrm{Ph}_{2} \mathrm{C}^{+} \mathrm{CH}_{2} \mathrm{Me}$
(II) $\mathrm{PhCH}_{2} \mathrm{CH}_{2} \mathrm{CH}^{+} \mathrm{Ph}$
(III) $\mathrm{Ph}_{2} \mathrm{CHCH}^{+} \mathrm{Me}$
(IV) $\mathrm{Ph}_{2} \mathrm{C}(\mathrm{Me}) \mathrm{CH}_{2}$ The order of stability is -
231628
Among the following carbocations:
(I) $\mathrm{Ph}_{2} \mathrm{C}^{+} \mathrm{CH}_{2} \mathrm{Me}$
(II) $\mathrm{PhCH}_{2} \mathrm{CH}_{2} \mathrm{CH}^{+} \mathrm{Ph}$
(III) $\mathrm{Ph}_{2} \mathrm{CHCH}^{+} \mathrm{Me}$
(IV) $\mathrm{Ph}_{2} \mathrm{C}(\mathrm{Me}) \mathrm{CH}_{2}$ The order of stability is -
231628
Among the following carbocations:
(I) $\mathrm{Ph}_{2} \mathrm{C}^{+} \mathrm{CH}_{2} \mathrm{Me}$
(II) $\mathrm{PhCH}_{2} \mathrm{CH}_{2} \mathrm{CH}^{+} \mathrm{Ph}$
(III) $\mathrm{Ph}_{2} \mathrm{CHCH}^{+} \mathrm{Me}$
(IV) $\mathrm{Ph}_{2} \mathrm{C}(\mathrm{Me}) \mathrm{CH}_{2}$ The order of stability is -