Question

In which of the following species hyperconjugation is possible?
Stability of carbocation, alkyl free radical and alkene can be explained on the basis of hyperconjugation. In all these cases there is the presence of hydrogen atom at the adjacent $s{p}^2$ hybridised carbon atom. Total no of hyperconjugating structures depends upon the no of hydrogen atoms present at adjacent carbon atom of $s{p}^2$ c- atom more the hyperconjugating structure more is the stability of ions.

• A. ${CH}_3{\stackrel{+}{-CH}}_2$
• B. ${C_{6}H}_5-{CH}_3$
• C. ${CH}_2={CH}_2$
• D. ${CH}_3-\stackrel{\underset{|}{{CH}_3}}{\underset{\stackrel{|}{{CH}_3}}{C}}-CH={CH}_2$

Answer 1

The correct option is B ${C_{6}H}_5-{CH}_3$

In the given option B, it shows the hyperconjugation stability because these component having $S{P}_2$ carbon and hydrogen atoms present at the adjacent carbon atom of $S{P}_2$ so this is stable