Primary alcohols can be obtained from the reaction of R Mg X with
CO2
HCHO
CH3CHO
H2O
B.
HCHO
The above reaction with acetaldehyde, CO2 and H2O gives 2alcohol, acid and alkane respectively.
Gabriel phthalimide reaction is used for the preparation of
primary aromatic amines
secondary amines
primary aliphatic amines
tertiary amines
C.
primary aliphatic amines
Gabriel's phthalimide synthesis is used for the preparation of primary aliphatic amines.
Which one of the following proteins transports oxygen in the blood stream?
Myoglobin
Insulin
Albumin
Haemoglobin
D.
Haemoglobin
Haemoglobin is metalloprotein (a protein that contains a metal) which binds with oxygen and transport it in the blood stream.
The general molecular formula for disaccharide is
C12H22O11
C10H20O10
C12H20O10
C12H22O10
A.
C12H22O11
Disaccharides are the carbohydrates which on hydrolysis gives two same or different monosaccharides. Their general formula is C12H22O11. eg,
C12H22O11 + H2OC6H12O6 + C6H12O6
sucrose glucose fructose
The monomers of terylene are
phenol and formaldehyde
ethylene glycol and phthalic acid
adipic acid and hexamethylenediamine
ethylene glycol and terephthalic acid
D.
ethylene glycol and terephthalic acid
Terylene it is a polymer of ethylene (ethane-1,2-diol) and terephthalic (benzene-1,4-dicarboxylic acid).
Proteins are composed of
- amino acids
carbohydrates
vitamins
mineral salts
A.
- amino acids
Proteins are long polymers of- amino acids linked by peptide (-CO-NH) bonds.
Which of the following statement is correct ?
+I group stabilises a carbocation
+I group stabilises a carbanion
-I group stabilises a carbocation
-I group stabilises a free radical
A.
+I group stabilises a carbocation
+I group (i.e., electron donating groups) stabilises the carbocation. +I and -I groups destabilises the carbanion and carbocations respectively. +I groups stabilised the free radicals but -I group destabilised them.
Common alum is
K2SO4.Al2(SO4)3.24H2O
(NH4)2SO4.FeSO4.6H2O
K2SO4.Cr2(SO4)3.24H2O
K2SO4.Fe2(SO4)3.24H2O
A.
K2SO4.Al2(SO4)3.24H2O
Common alum is K2SO4.Al2(SO4)3.24H2O.
Heating of rubber with sulphur is called
vulcanisation
galvanisation
sulphonation
bessemerisation
A.
vulcanisation
Vulcanisation is a chemical process which is used to harden rubber. During this process, sulphur forms cross links at the reactive sites of double bonds and thus results in hardening of rubber.
Ethyl alcohol reacts with thionyl chloride to give
CH3CH2Cl + HCl
CH3CH2Cl + H2O + SO2
CH3CH2Cl +HCl + SO2
CH3CH2Cl +SO2 + Cl2
C.
CH3CH2Cl +HCl + SO2
CH3CH2OH + SOCl2CH3CH2Cl + HCl + SO2
This method is preferred for the preparation of alkyl halide because both by product of the reaction ( i.e, SO2 and HCl) are gases and can easily escape leaving behind pure alkyl halide.