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Practice Online Test Series for JEE Main 2018 & NEET 2018
Which of the following is carbocations is least stable
Beryllium is placed above magnesium in the second group. Beryllium dust, therefore, when added to `MgCl_2` solution will
The structural formula of monomer of polymethymethacrylate (PMMA) is
The rate constant, the activation and Arrhenius parameter of a chemical reaction at 25 ºC are `3 xx10^(–4) s^(–1)`, 104.4 kJ `mol^(–1)` and `6 × 10^14 s^(–1)` respectively. The value of the rate constant at `T->oo` is
The ionization energy of H–atoms is 13.6 eV. The ionization energy of `Li ^(+2)` ion will be
Identify the product C in the series
Dipole moment of `CH_3CH_2CH_3 (I), CH_3CH_2OH(II) & CH_3CH_2 F(III)` is in order
A carbon compound A forms B with sodium metal and again A forms C with `PCl_5` , but B and C form diethyl ether. Therefore A, and B and C are
Which set of the following compounds on reaction with an alkyl amine gives Schiff's base
Consider the following complexes
`(i) K_2 Pt Cl_6 (ii) PtCl_4 .2NH_3`
`(iii) PtCl_4 .3NH_3 (iv) PtCl_4 .5NH_3`
Their electrical conductances in aq. solutions are
`LiAlH_4` is strong reducing agent and reduces most of the functional groups to alcohol. The product obtained after reduction of dimethylcarbinol with `LiAlH_4`, it produces :
Primary amine on reaction with a mixture of chloroform and alc. KOH produced isocyanides while phenol on reaction with a mixture of chloroform and aq KOH produces :
Which of the following chemical reactions will produce phenol ?
In the below reaction, B is
Aldohexoses are six carbon sugars with four chirality centres and an aldehyde carbonyle group. There are 16 possible stereoisomerc aldohexoses. D-glucose and D-manmose are X of each other X is :
Nylon 4 can be prepared by polymerisation of
CFCs, HCFCs and halons destroy the earth's protective ozone layer, which shiilds the earth from harmful ultraviolet rays generated from the sun. Why CFC are widely used in air conditioners ?
Most of the organic compounds are generally used in the formation of drugs. 1.1% solution of phenol is used as
How many carbon in 2 methyl pentan-3-one is `sp^2` hybridised ?
Which of the following is not correctly mathced
