The enthalpy change on freezing of 1 mol of water at 50C to ice at −50C is :
(Given fus H = 6 kJ mol−1 at 00C,
Cp (H 2O, ) = 75.3 J mol−1 K−1,
Cp (H2O, s) = 36.8 J mol−1 K−1)
5.44 kJ mol−1
5.81 kJ mol−1
6.56 kJ mol−1
6.00 kJ mol−1
The IUPAC name of the following compound is :
1, 1-Dimethyl-2-ethylcyclohexane
2-Ethyl-1,1-dimethylcyclohexane
1-Ethyl-2,2-dimethylcyclohexane
2, 2-Dimethyl-1-ethylcyclohexane
Which of the following statements is not true about partition chromatography ?
Mobile phase can be a gas
Stationary phase is a finely divided solid adsorbent
Separation depends upon equilibration of solute between a mobile and a stationary phase
Paper chromatography is an example of partition chromatography
The major product of the following reaction is :
CH2=CHCH2CH=CHCH3
CH2=CHCH=CHCH2CH3
CH3CH=C=CHCH2CH3
CH3CH=CH−CH=CHCH3
The major product expected from the following reaction is :
Among the following, the essential amino acid is :
Alanine
Valine
Aspartic acid
Serine
Which of the following compounds will not undergo Friedel Craft’s reaction with benzene ?
The reason for “drug induced poisoning” is :
Binding reversibly at the active site of the enzyme
Bringing conformational change in the binding site of enzyme
Binding irreversibly to the active site of the enzyme
Binding at the allosteric sites of the enzyme
A mixture containing the following four compounds is extracted with 1M HCl. The compound that goes to aqueous layer is :
(I)
(II)
(III)
(IV)