What is the R in chemical formula?

R denotes a radical group. R means alkyl group ( general formula is CnH2n+1 eg. CH3, C2H5,C3H7).

What is R and AR in organic chemistry?

“Aryl” is used for the sake of abbreviation or generalization, and “Ar” is used as a placeholder for the aryl group in chemical structure diagrams, analogous to “R” used for any organic substituent. “Ar” is not to be confused with the elemental symbol for argon.

What is R effect?

+R effect: The +R effect or positive resonance effect is expressed by the electron donating groups (for eg. –NH2, -OH, -OR etc) which release electrons or donate electrons to the rest of the molecule by delocalization of electrons within the molecule.

What is R and R chemistry?

Functional groups are groups of atoms found within molecules that are involved in the chemical reactions characteristic of those molecules. The symbol R and R’ refer to an attached hydrogen or hydrocarbon side chain or sometimes to any group of atoms.

How many alkyl group are in butane?

Two alkyl groups
Two alkyl groups are derived from butane and two from isobutane. If a primary carbon atom of butane loses a hydrogen atom, an n-butyl group results; if a secondary carbon atom of butane loses a hydrogen atom, a secondary alkyl group, sec-butyl, forms.

What is R dash in chemistry?

In organic chemistry, functional groups are specific groups of atoms within molecules arranged in a specific manner. The symbols R, R’, R” and R”’ usually denote a hydrocarbon chain or a hydrogen but can sometimes be any group of atoms.

What is R effect and I effect in chemistry?

For example, the -OH and -NH2 groups withdraw electrons by inductive effect (-I). However they also release electrons by delocalization of lone pairs (+R effect). Since the resonance effect is more stronger than inductive effect the net result is electron releasing to rest of the molecule.