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If a Facebook page has not posted anything for a while, it suggests a lack of care about the page and its followers and it’s unlikely to win new followers. When current or potential followers see a constant flow of new information, the page feels active and alive. There are three main strategies that will help you to attract new followers: The first thing you need to do is to increase traffic to your Facebook page. If you know what you’re doing, this can provide a huge number of opportunities for monetizing your Facebook page. It has 1.86 billion active monthly users and this number is constantly increasing. Facebook is one of the companies at the top of the Social Media hierarchy. The addition of a diene to a dienophile to form a six-membered ring is called (4+2) cycloaddition reaction or Diel-Alder reaction.Is it possible to imagine modern life without social media? Just a few years ago the answer would be yes – but now there’s no hiding from it. These reactions do not require any catalyst and are initaited either by heat or light.Īddition of one ethene molecule(2π-electron system) to another ethene molecule (2π-electron system) is called as 2π+2π or ( 2+2 ) cycloaddition reaction. In these reactions, bond making and bond breaking occurs simultaneously. These reactions occur in a single step via a cyclic transition state. Reactions which involve interconversion of one isomer into another keeping the molecular formulae as well as the carbon skeletons of the reactants and the products intact are called isomerization reactions.įor Ex: Interconversion of trans-but-2-ene to cis-but-2-ene and vice versa. Hofmann bromamide reaction involving the conversion of 1° amides to 1° amines on treatment with Br 2 in presence of KOH.
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Wohler synthesis of urea from ammonium cyanate is also example of rearrangement reaction. (1) Dehydration of 2,2-dimethylpropan-1-ol with conc H 2SO 4 occurs through 1,2-migration of the methyl group to give rearranged product. Reactions involving the migration of an atom or a group from one atom to another within the same molecule are called rearrangement reactions. Since β-hydroxyaldehyde or ketones are called as aldols therefore this reaction is called aldol condensation.Ĭondensation reaction which occurs with the elimination of a molecule of water is the reaction between benzaldehyde and aniline to from benzylideneaniline. Two molecules of acetaldehyde condense in presence of dilute alkali to from 3-hydroxybutanal. In these reactions, two or more molecules of the same or different reactants combine to form a product with or without the elimination of simple molecule such as H 2O, HCl, NH 3, ROH.
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This reaction is called Freund reaction and is extensively used for the synthesis of three membered rings. In these reactions, loss of two atoms or group occurs from α and γ position of the molecule leading to the formation of three-membered rings. These reactions are typical of arenes and other aromatic compounds.īase catalysed dehydrohalogenation of alkyl halides Substitution reactions which are brought about by electrophiles are called electrophilic substitution reaction. HO‾ + R-X ->R-OH +X‾ (2) Electrophilic Substitution Reaction Substitution reactions which are brought about by nucleophiles are called nucleophilic substitution reaction.Ī stronger nucleophile usually displaces a weaker nucleophile. Th product obtained as a result of substitution is called substitution product and the new atom or group of atoms which enters the molecule is called a substituent.ĭepending upon the nature of the attacking species the substitution reaction are of the following three types: (1) Nucleophilic Substitution Reaction
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