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The compound 'A' when treated with methyl alcohol and few drops of H₂SO₄ give wintergreen smell. The compound 'A' is
Salicylic acid gives wintergreen smell with methyl alcohol and H2SO4 to form Methyl salicylate.
Which of the following will not give iodoform test?
Benzyl alcohol does not have the CH3CO- group or CH3CH2O- so it will not give the positive iodoform test.
Phospholipids are esters of glycerol with
Phospholipids are esters of glycerol with two carboxylic acid residue and one phosphate group. Hence, phospholipids may be regarded as derivative of glycerol in which two hydroxyl group are esterified with a fatty acid, while third is esterified with phosphoric acid.
In graphite, the electrons are
In graphite, each carbon atom uses only 3 of its 4 outer energy level electron in covalently bonding to there other carbon atoms in a place. In graphite, electrons are spread out between the structure.
The maximum number of unpaired d-electrons are in
Fe+3 has 5 unpaired electrons, more than other ones.
Splitting of spectral lines under the influence of magnetic field is called
Alkyl groups are o- and p-directing because of
Hyperconjugation effect in Alkyl group:
In which of the following molecule, all the atoms lie in one plane?
It has got sp2 hybridization, giving it a planar structure.Further backbonding from flouine makes the B-F bonds stronger than normal single bonds.
Pairs of species having identical shapes for molecules is
Which one of the following is expected to exhibit optical isomerism
Optical isomers of cis-[Co(en)₂Cl₂] :
Nickel is purified by
The Mond process, sometimes known as the carbonyl process, is a technique created by Ludwig Mond in 1890, to extract and purify nickel. The process was used commercially before the end of the 19th century. This process converts nickel oxides into pure nickel.
The oxidation state of Cr in [Cr(NH₃)₄Cl₂]⁺ is
Applying sum of individual charge = charge on molecule
x+(0)×4 + (-1)×2 = +1
Which of the following noble gas is least polarisable?
Helium is the least polarizable noble gas due to presence of weakest Van der Waal's forces.
The IUPAC name of
Correct name is 2-Chloro-4-ethyl-3-methyl hept-2-ene-6-yne
When HCl gas is passed through a saturated solution of common salt, pure NaCl is precipitated because
When hydrogen chloride gas (HCl) is circulated through the saturated solution.
HCl and NaCl dissociate into their respective ions as:
NaCl → Na+ + Cl-
HCl → H+ + Cl-
The concentration of Cl− ions increases considerably in solution due to ionization HCl.
Hence, the ionic product [Na+][Cl−] exceeds the solubility product of sodium chloride and, therefore, pure sodium chloride precipitates out from the solution.
Which of the following pair represents stereoisomerism?
Which of the following pair of elements belongs to same period of the periodic table?
Calcium and zinc both belong to the same period, i.e Period 4
Natural rubber is a polymer of
Natural rubber is from the monomer cis-isoprene (2-methyl-1,3-butadiene).
It is an addition polymer that is obtained as a milky white fluid known as latex from a tropical rubber tree.
In view of their low ionization energies, the alkali metals are
Alkali metals can readily lose their lone electron to form +1 oxidation state and can easily ionize this electron and this ns1 configuration results in alkali metals to have large ionic and atomic radii and they have high second ionization energy. This ionization energy decreases down the group and act as strong reducing agent.
100 ml of a liquid A was mixed with 25 ml of a liquid B to give B to give a non-ideal solution of A-B mixture. The volume of this mixture would be
For non-ideal solution, ΔVmix < 0.
Final volume decreases due to negative deviation from original volume 125 ml.
Hence, total volume will be little less than (100 + 25 = 125 mL).
Total number of species in which atleast one atom have same hybridization as in central atom of azide ion.
N2O, C2H2, CO2, C3O2, BeF2, NO2, PF3
N2O, C2H2, CO2, C3O2, BeF2
How many chiral centers are in the following compound?
An ideal solution was found to have a vapour pressure of 80 torr when the mole fraction of a non-volatile solute was 0.2. What would be the vapour pressure of the pure solvent at the same temperature?
What is the final temperature (in kelvin) of 0.10 mole monoatomic ideal gas that performs 75 cal of work adiabatically if the initial temperature is 227°C ? (use R = 2 cal/K-mol)
log p v/s log RT curve plotted for 1 mole ideal gas. Calculate molar volume occupied by gas? (in liter)