Question

Q.2(a) With the help of energy profile diagrams differentiate between (i) exothermic and
endothermic reactions (ii) intermediate and transition state.

(b) How will you synthesize Grignard's reagent? Explain its structure in detail.

(c) Which intermediate is formed by photochemical homolysis of a covalent bond? Give its
structure, hybridization, types and stability order.

Answer 1

Answer:

i) exothermic reaction are the reaction where heat is not given but evolved and endothermic reaction is a reaction where heat is required.

ii) An intermediate differs from a transition state in that the intermediate has a discrete lifetime (be it a few nanoseconds or many days), whereas a transition state lasts for just one bond vibration cycle. An intermediate may be an unstable molecule (a reactive intermediate) or a highly stable molecule.

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