1.

The correct stability order for the following species is

Answer»

(II) gt (IV) gt (I) gt (III)
(I) gt (II) gt (III) gt (IV)
(II)gt (II)gt (III) gt (IV)
(I) gt (III) gt (II) gt (IV)

Solution :Carbocation (I) is STABILIZED by + R-effectof O-atomas wellas +I -effectof TWO ` -CH_(3)`GROUPS , carbocation(II)is stabilized by +I-effectof ` -CH_(3)` and `CH_(2)CH(CH_(3))_(2)` groups, carbocation, (III)is stabilized by+ R-effectof O - atom and +I-effect of one `-CH_(3)`,group while carbocation (IV) is stabilizedby +I- effect of ` -CH_(2)CH_(2)CH(CH_(3))_(2)` group THUS , decreasing , order of stability of thesecarbocations is : ` I lt III lt II lt IV `


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