Formic acud is a stronger acid than acetic acid. This can be explained using
+M effect
-I effect
+I effect
-M effect
Mesomeric effect involves
delocalisation of π- electron
delocalisation of σ- electron
partial displacement of electrons
delocalisation of π and σ- electron
A.
delocalisation of π- electron
Resonance or mesomeric effect is defined as, the polarity produced in the molecule by the interaction of two π-bonds or between a π-bond and a lone pair of electrons present on an adjacent atom There are two types of mesomeric effect.+M effect is observed when direction of electron displacement is away from an atom or substituent group attached to the conjugated system eg, - halogen, -OH, —NH2, etc On the other hand,–M effect is observed when the transfer of electrons Is towards the atom or substituent group attached to the conjugted systems, eg, —NO2 ,—COOH etc.
The IUPAC name of
2-hydroxy-4-pentanone
2-oxo-4-pentanol
4-keto-2-pentanol
4-hydroxy-2-pentanon
An oxygen containing organic compound was found to contain 52% carbon and 13% of hydrogen. Its vapour density is 23.The compound reacts with sodium metal to liberate hydrogen. A functional isomer of this compound is
ethanal
methoxy methane
methoxy ethane
ethanol
Mesa compounds do not show optical activity because
they do not contain chiral carbon atoms
they have non-superimposable mirror images
they contain plane of symmetry
they do not contain plane of symmetry
An aromatic compound 'A' (C7H9N) on reacting with NaNO2/HCl at 0°C forms benzyl alcohol and nitrogen gas. The number of isomers possible for the compound 'A' is
5
7
3
6
Carbocation as an intermediate is likely to be formed in the reaction
Propene + Cl2 2-chloropropane
Acetone + HCN acetonecyano hydrin
Ethylbromide + aq.KOH ethyl alcohol
Hexane 2-methyl pentane