MolSynapsequestion bank

MolSynapse / Question bank / General Organic Chemistry I: Electronic Effects / Applications: stability of carbocations, carbanions, free radicals

JEE Main levelOne or more correct optionsDifficulty 2 of 3g1220

Which of the following carbocations are stabilised by resonance?

A $CH X_{2} = CH - CH X_{2} X^{+}$
B $C X_{6} H X_{5} CH X_{2} X^{+}$
C $(CH X_{3}) X_{3} C X^{+}$
D $CH X_{3} - O - CH X_{2} X^{+}$

Answer: A, B, D

CH X_{3} OCH X_{2} X^{+}

is stabilised by the oxygen lone pair, benzyl by the ring and allyl by the double bond.

(CH X_{3}) X_{3} C X^{+}

is stabilised only by hyperconjugation and +I effect, which is not resonance.

Practice General Organic Chemistry I: Electronic Effects More on Applications: stability of carbocations, carbanions, free radicals

Previous questionNext question

More questions on Applications: stability of carbocations, carbanions, free radicals

Which of the following carbanions is the most stable? JEE Main level
Consider I 1-methylcyclopentyl cation, II cyclopentyl cation and III bicyclo[2.2.1]hept-1-yl cation (cation at the bridgehead carbon). The c... JEE Advanced level
Which of the following statements are correct? JEE Advanced level
The three species cyclopentadienyl cation, cyclopentadienyl radical and cyclopentadienyl anion (each planar, C5H5 with charge +, none, -) ar... JEE Advanced level
Free-radical bromination of 2,3-dimethylbutane, (CH3)2CH-CH(CH3)2, with Br2 and light is very selective. The major monobromo product is: JEE Advanced level
Which of the following free radicals is the most stable? NEET level