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Standard XII

Chemistry

Heat of Formation

Resonance Ene...

Question

Resonance Energy of Toluene is 37.5 kcal/mol while that of Benzene is 36 kcal/mole. Then which of the following explains this difference?

Zeeman effect

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Electromeric effect

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Hyper-conjugation

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I effect

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Solution

The correct option is C Hyper-conjugation
Resonance Energy of Toluene is $37.5 k c a l / m o l$ while that of Benzene is $36 k c a l / m o l e$ then hyperconjugation explains this difference. In other words, the extra stabilization of toluene than benzene by $37.5 - 36 = 1.5 k c a l / m o l$ is due to hyperconjugation in toluene.

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Similar questions

Q. Heat of hydrogenation for one mole of cyclohexene is 29 kcal and for one mole of benzene is 51 kcal. Then find the resonance energy of benzene (magnitude only).

एक मोल साइक्लोहेक्सीन के लिए हाइड्रोजनीकरण ऊष्मा 29 kcal है तथा एक मोल बेन्जीन के लिए यह 51 kcal है। तब बेन्जीन की अनुनाद ऊर्जा (केवल परिमाण) ज्ञात कीजिए।

Q. From the following thermochemical equations:

C_{2} H_{4} \to C_{2} H_{6}; △ H = - 32.7 k c a l

C_{6} H_{6} + 3 H_{2} \to C_{6} H_{12}; △ H = - 49.2 k c a l

Calculate resonance energy of benzene.

Q. Bond energy of

H - H, F - F

and

H - F

bonds are

104, 38

and

135

kcal mol

^{- 1}

respectively. Resonance energy (in

k c a l m o l^{- 1}

) in the

H - F

molecule is :

Cyclohexene H_{2} - \to N i Cyclohexane; Δ H = - 28.6 kcal/mol

Anthracene H_{2} - \to N i Tetradecahydroanthracene; Δ H = - 116.2 kcal/mol

The resonance energy of anthracene is

x kcal/mol

. Magnitude of

x

is:

Q. Calculate the electronegativity (eV) of chlorine from the bond energy of

C l - F

bond (61 kcal mol

^{- 1}

F - F

bond (

38

kcal mol

^{- 1}

) and

C l - C l

bond (

58

kcal mol

^{- 1}

) and electronegativity of fluorine (

4.0

eV).
Based on Pauling's scale :

(E N)_{F} - (E N)_{C l} = k \sqrt{Δ} = 0.208 \sqrt{Δ}

where,

Δ

is resonance energy and k is the conversion factor (which is

0.208

for converting kcal into eV).

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Resonance Energy of Toluene is 37.5 kcal/mol while that of Benzene is 36 kcal/mole. Then which of the following explains this difference?

The correct option is C Hyper-conjugationResonance Energy of Toluene is 37.5kcal/mol while that of Benzene is 36kcal/mole then hyperconjugation explains this difference. In other words, the extra stabilization of toluene than benzene by 37.5−36=1.5kcal/mol is due to hyperconjugation in toluene.