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Covalent Bond

an organic co...

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an organic compound has 5 c=c bond .HEAT OF HYDROGENATION OF C=C BOND IS 28.6Kcal EXPERIMENTAL VALUE OF HEAT OF HYDROGENATION IS 98Kcal MOL-1 .THE RESONANCE ENERGY IS

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Q. An organic molecule has

5

=

C bonds (heat of hydrogenation for C

=

28.8

m o l^{- 1}

) at experiment value for heat of hydrogenation is

99

m o l^{- 1}

. The resonance energy in kJ

m o l^{- 1}

Q. The heat of hydrogenation of one double bond in cyclohexene is 28.6kcal

{m o l}^{- 1}

and the heat of hydrogenation of benzene to cyclohexane is 50kcal

{m o l}^{- 1}

. What will be the resonance stabilization energy of benzene?

Heat of hydrogenation of cyclohexane is -119KJ and heat of hydrogenation of benzene is 206KJ/mole. Find the resonance energy of benzene.

Q. The heat of atomization of a compound

X Y_{3}

in gaseous state is

E k J m o l^{- 1}

. What is the bond energy of

X - Y

k J m o l^{- 1}

Q. Enthalpy of hydrogenation is the enthalpy change when one mole of unsaturated compound is converted to saturated compound. Heat of hydrogenation helps to calculate resonance energy.
The standard enthalpy of combustion at

25^{\circ} C

of hydrogen, cyclohexene

(C_{6} H_{10})

and cyclohexane

(C_{6} H_{12})

are –300,–3600 and –3770 KJ/mole respectively. Calculate the heat of hydrogenation of cyclohexene.

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