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(D) Key Idea: The number of no-bond resonance (hyperconjugation) structures is equal to the number of $\alpha$-hydrogen atoms present on the carbon at

Vedclass · Accepted Answer

Toluene $(C_6H_5-CH_3)$

Vedclass · Answer

(D) Key Idea: The number of no-bond resonance (hyperconjugation) structures is equal to the number of $\alpha$-hydrogen atoms present on the carbon atom directly attached to the benzene ring.$(a)$ tert-Butylbenzene: The $\alpha$-carbon has $0$ $H$-atoms. Number of hyperconjugation structures = $0$.$(b)$ Ethylbenzene: The $\alpha$-carbon $(CH_2)$ has $2$ $H$-atoms. Number of hyperconjugation structures = $2$.$(c)$ Isopropylbenzene: The $\alpha$-carbon $(CH)$ has $1$ $H$-atom. Number of hyperconjugation structures = $1$.$(d)$ Toluene: The $\alpha$-carbon $(CH_3)$ has $3$ $H$-atoms. Number of hyperconjugation structures = $3$.Since toluene has the maximum number of $\alpha$-hydrogen atoms $(3)$,it has the maximum number of no-bond resonance structures. Hence,option $(d)$ is the correct answer.

Identify the compound which has the maximum number of no-bond resonance (hyperconjugation) structures.

Similar Questions

Consider the following compounds. Hyperconjugation occurs in:

Give three points of difference between the inductive effect and the resonance effect.

The increasing order of the electron-withdrawing power of the following functional groups is:
a. $-CN$
b. $-COOH$
c. $-NO_2$
d. $-I$

Identify the species from the following that exhibits no-bond resonance.

Draw the hyperconjugation resonance structures of:
$(a) \ CH_3-CH=CH_2$
$(b) \ CH_3-CH_2^+$
$(c) \ CH_3-CH_2-CH_2^+$

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