CBSE
Which one of the following characteristics belong to an electrophile?
It is any species having electron deficiency which reacts at an electron-rich C-centre
It is any species having electron enrichment, that reacts at an electron-deficient C-centre
It is cationic in nature
It is anionic in nature
Explain why aniline is not as basic as ammonia.
Among the following statements about the molecules X and Y, the one(s) which correct is (are)
X and Y are diastereomers
X and Y are enantiomers
X and Y are both aldohexoses
X is a D-sugar and Y is an L-sugar
The two structures written below represent
pair of diastereomers
pair of enantiomers
same molecule
both are optically inactive
Among the following structures the one which is not a resonating structure of others is
I
II
III
IV
A compound is formed by substitution of two chlorine for two hydrogens in propane. The number of possible isomeric compounds is
4
3
2
5
Which one of the following will show optical isomerism?
OH-CH2-CO2H
CH3-CH(OH)-CO2H
(CH3)2-CH-CO2H
(CH3)2-C(Cl)-CO2H
The well-known compounds, (+)- lactic acid and (-)- lactic acid, have the same molecular formula, C3H6O3. The correct relationship between them is:
constitutional isomerism
geometrical isomerism
identicalness
optical isomerism
Among the following carbocations:
Ph2C+CH2Me (I), PhCH2CH2CH+Ph (II), Ph2CHCH+Me (III) and Ph2C(Me)CH2 (IV), the order of stability is:
IV > II > I > III
I > II > III > IV
II > I > IV > III
I > IV > III > II
Which of the following carbocations will be most stable ?