The descending order of stability, of the carbonium ions C 6 H 5 overset+C H 2( I ), p( CH 3 O ) C 6 H 4 overset+C H 2( II ), p( NO 2) C 6 H 4 overset+C H 2( III ) and p( CH 3) C 6 H 4 overset+ C H 2( IV )

Question

The descending order of stability, of the carbonium ions C 6 H 5 overset+C H 2( I ), p( CH 3 O ) C 6 H 4 overset+C H 2( II ), p( NO 2) C 6 H 4 overset+C H 2( III ) and p( CH 3) C 6 H 4 overset+ C H 2( IV ) (A)  IV>II>I>III  (B)  II>IV>m>l  (C)  II>IV>I>III  (D)  IV>II>III>I text

Tardigrade Admin · Accepted Answer

In the presence of electron releasing group, (like CH3,CH3O ), the positive charge is dispersed more. This dispersal of positive charge stabilises the carbocation (carbonium ion). While electron withdrawing substituent (like NO2 ) destabilises the carbonium ion by intensifying the positive charge. Thus, the order of stability of given benzyl carbonium ions is as

Q. The descending order of stability, of the carbonium ions
$C_{6} H_{5} C + H_{2} (I), p (C H_{3} O) C_{6} H_{4} C + H_{2} (II), p (N O_{2}) C_{6} H_{4} C + H_{2} (III)$ and $p (C H_{3}) C_{6} H_{4} C + H_{2} (I V)$

$I V > II > I > III$

$II > I V > m > l$

$II > I V > I > III$

$I V > II > III > I$

Q. The descending order of stability, of the carbonium ions C6​H5​C+H2​(I),p(CH3​O)C6​H4​C+H2​(II),p(NO2​)C6​H4​C+H2​(III) and p(CH3​)C6​H4​C+H2​(IV)

IV>II>I>III

II>IV>m>l

II>IV>I>III

IV>II>III>I

Q. The descending order of stability, of the carbonium ions
$C_{6} H_{5} C + H_{2} (I), p (C H_{3} O) C_{6} H_{4} C + H_{2} (II), p (N O_{2}) C_{6} H_{4} C + H_{2} (III)$ and $p (C H_{3}) C_{6} H_{4} C + H_{2} (I V)$

$I V > II > I > III$

$II > I V > m > l$

$II > I V > I > III$

$I V > II > III > I$