A stable compound has……………………….heat of formation.

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 order of heat of formation of the following molecules 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

Assertion: Alkaline earth metal oxides are quite stable to heat. Reason: Enthalpies of formation of alkaline earth metal oxides are quite high.

Metals react with non-metals to form stable compounds called ______ compounds.

Write shot notes on the Heat of formation.

Since the enthalpy of elements in their natural state is taken to be zero, the heat of formation (Delta_(f)H) of compounds

Which of the following values of heat of formation does indicate that the product is least stable ? - 94 kcal - 231.5 kcal +64.8 kcal. +21.4 kcal

Formation of interstitial compound makes the transition metal

Which of the following value of heat of formation indicates that product is least stable

The heat of formation is the change in enthalpy accompanying the formation of a substance fiom its elements at 298 K and 1 atm pressure. Since the anthalpies of elements are taken to be zero, the heat of formation (triangleH) of compounds