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
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
The number of optical isomers of the compound CH3—CHBr—CHBr—COOH is
0
1
3
4
D.
4
Compounds having similar physical and chemical properties but differing only in the behaviour towards polarised hght are called optical isomers.The number of possible stereoisomers when molecule cannot be divided into two equal halves , i.e, molecule has no symmetry
(i) The number of d- and l-forms a= 2n (where n = number of asymmetric carbon atoms).
...a =2n = 22 = 4.
Total number of meso forms, m = 0
Total number of optical isomers = a+m
= 4 +0 = 4
Here (i) and (iii),(i) and (iv), (ii) and (iii), (ii) and (iv) are diastereomeric pairs while (i) and (ii), (iii) and (iv) are enantiomers.
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