(CH3)3C–CHO does not undergo Aldol condensation due to
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Solution
Aldol condensation is given by the compounds which contain α hydrogen atom. As the given compound does not contain α hydrogen atom. Hence it does not undergo aldol condensation.
Some of the properties of the two species, \(NO_{3}^{-}\) and H3O+ are described below. Which one of them is correct?
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Solution
In \(NO_{3}^{-}\), nitrogen have sp2 hybridisation, thus planar in shape. In H3O+, oxygen is in sp3 hybridisation,thus tetrahedral geometry is expected but due to presence of one lp of electrons on central oxygen atom it is pyramidal in shape.
A solution is formed by diluting 250 ml. of 0.400 N H2SO4 with one litre of water. The normality of above formed solution is :
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Solution
If 500 ml of gas A at 400 torr and 666.6 ml of B at 600 torr are placed in a 3 litre flask, the pressure of the system will be
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Solution
An organic compound A containing nitrogen, on acid catalysed hydrolysis produces a water soluble organic compound B and a gaseous compound C. When methyl magnesium bromide is slowly added to A in 1 :1 ratio and hydrolysed, it produces a compound which can be obtained by dry distillation of the calcium salt of B. The compound A is
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Solution
The catalyst used in the Wacker process of oxidation of ethyne to ethanal is
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Solution
Ethyne get converted to aldehydes and ketones when treated with an acidified aqueous solution of palladium chloride (PdCl2) and cupric chloride (CuCl2) in presence of air or oxygen. This method is known as Wacker’s process.
The kinetic energy of an electron in the second Bohr orbit of a hydrogen atom is [a0 is Bohr radius] :
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Solution
If the equilibrium constant of the reaction of weak acid HA with strong base is 107, then pOH of the aqueous solution of 0.1M NaA is –
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Solution
Z in the above reaction sequence is
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Solution
The charge on colloidal particles is due to
Some statements about heavy water are given below:
(A)Heavy water is used as a moderator in nuclear reactors.
(B)Heavy water is more associated than ordinary water.
(C)Heavy water is more effective solvent than ordinary water.
Which of the above statements are correct?
Solubility product of BaCl2 is 4 × 10-9 moles/litre. Its solubility would be :
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Solution
The above structural formula refers to
Which one of the following, statements is incorrect about enzyme catalysis?
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Solution
Enzymes are most reactive at optimum temperature. The optimum temperature for enzyme activity lies between 40°C to 60°C.
The element which is used as semiconductor is
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Solution
Semiconductors are those solids which are good conductors of electricity at room temperature but behave as insulators at room temperature, e.g., silicon and germanium.
The correct order of heat of formation of halogen acids is
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Solution
On moving from top to bottom of halogen group the bond dissociation energy of hydrogen halides decreases and so the heat of formation of halogen acids also decreases.
Which of the following has density greater than water?
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Solution
Li, Na, K are lighter than water but Rb is heavier than water.
In the following reaction
\(C_{2}H_{5}OC_{2}H_{5} + 4[H] \overset{Red P + HI}{\rightarrow} 2X + H_{2}O\) , X is
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Solution
Identify the non polar molecule in the following compounds:
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Solution
In H2, both atoms are identical, so the molecule is non polar.
An aqueous solution containing 1 gm of urea boils at 100.25ºC. The aqueous solution containing 3 g of glucose in the same volume will boil at (mol. wt. of urea = 60 and of glucose= 180) :
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Solution