Question

give a brief account of free rqdical​

Answer 1

Explanation:

chemistry, a radical is an atom, molecule, or ion that has an unpaired valence electron.[1][2] With some exceptions, these unpaired electrons make radicals highly chemically reactive. Many radicals spontaneously dimerize. Most organic radicals have short lifetimes.

A notable example of a radical is the hydroxyl radical (HO•), a molecule that has one unpaired electron on the oxygen atom. Two other examples are triplet oxygen and triplet carbene (:CH

2) which have two unpaired electrons.

Radicals may be generated in a number of ways, but typical methods involve redox reactions. Ionizing radiation, heat, electrical discharges, and electrolysis are known to produce radicals. Radicals are intermediates in many chemical reactions, more so than is apparent from the balanced equations.

Radicals are important in combustion, atmospheric chemistry, polymerization, plasma chemistry, biochemistry, and many other chemical processes. A large fraction of natural products is generated by radical-generating enzymes. In living organisms, the radicals superoxide and nitric oxide and their reaction products regulate many processes, such as control of vascular tone and thus blood pressure. They also play a key role in the intermediary metabolism of various biological compounds. Such radicals can even be messengers in a process dubbed redox signaling. A radical may be trapped within a solvent cage or be otherwise bound.

Answer 2

Answer:

Divas period of time from 2.5 million years ago to add add add 500 Sort the appearance of the first human being and the creations of the first Civilization our earliest Akshay sir appeared in Africa's mm 2.5 million years ago having involve from man eggs who came down from the tree and learn to walk up right on two legs over thousands of year people learn how to make free to keep themselves warm and to cook the deer deer food how to hunt a how to make tools the first ever metal to tools and weapons were made in the Middle East about 7000 years ago throughout the world early people living why hunting animals and grass carrying wild food fruit fruit and nuts to be eaten by 10000 year ago however the extender Re change was taking place people learnt how to make deer on crops on purchase to land and to write your own begin to build permanent home followed by town and cities