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Diethenyl pentadiene is :...

Diethenyl pentadiene is :

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1,3-pentadiene and 1,4-pentadiene are compared with respect to their intrinsic stability and reaction with HI. The correct statement is :

The enthalpy of hydrogenation for 1-pentene is +126 kJ/mol. The enthalpy of hydrogenation for 1, 3-pentadiene is +230 kJ/mole. Hence estimate the resonance energy of 1, 3-pentadiene.

Addition of one equivalent of bromine to 1, 3-pentadiene at temperature below 0^(@)C produces :

1,3- Pentadiene and 1,-4 - pentadiene are compared with respect to their intrinsic stability and reaction with HI . The correct statement is

Hydrogenation of unsaturated hydrocarbons is an exothermic reaction. Due to hyperconjugation and resonance the stability of unsaturated hydrocarbons increases and the increase in stability is more due to resonance. Compound with same number of pi- bonds and more stability has lower heat of hydrogenation. Heat of formation is defined as the energy evolved when a molecule is formed from its atoms. For isomers the more stable compounds has higher heat of formation. The correct heat of hydrogenation order is : (p) 1,3-Pentadiene (q) 1,3-Butadiene (r) 2,3-Dimethyl-1,3-butadiene (s) Propadiene

Correct the following names : 3-ethyl-2-chloro-1, 4-pentadiene.

1,4-Pentadiene reacts with excess of HCl in the presence of benzoyl peroxide to give compound X , which upon reaction with excess of Mg in dry ether forms Y . Compound Y on treatment with ethyl acelate followed by treatment with dilute acid yields Z . Identify the structure of componds. X, Y and Z .

The concept of resonance explains various properties of compounds.The molecules with conjugated system of pi bonds, are stabilized by resonace and have low heat of hydrogenation.Hyperconjugative stabilization also decreases heat f hydrogenation.In aromic rings a functional group with a lone pair of electron exerts +m effect. Some functional groups like -NO, -NC, -CH= CH_2 can function both as electron releasing (+m,+R) or electron withdrawing (-m,-R) groups.More extended conjugation provides more stabilization. The correct heat of hydrogenation order is (p)1,3-Pentadiene , (q)1,3-Butadiene , (r)2,3-Dimethyl-1,3-butadiene , (s)Propadiene

The concept of resonance explains various properties of compounds.The molecule with conjugated system of pi bonds, are stabilized by resonance and have low heat of hydrogenation .Hyperconjugative stabilization also decreases heat of hydrogenation. In aromatic rings a functional group with a lone pair of electron exerts +m effect.Some functional groups like -NO, -NC, -CH=CH_2 can function both as electrons releasing (+m,+R) or electron withdrawing (-m,-R) groups.More extended conjugation provides more stabilization. The correct heat of hydrogenation order is (p)1,3-Pentadiene , (q)1,3-Butadiene , (r)2,3-Dimethyl-1,3-butadiene , (s)Propadiene