WB JEE 2019

Cyclopentanol on reaction with NaH followed by CS2 and CH3I produces a/an

Oxidation of allyl alcohol with a peracid gives a compound of molecular formula C3H6O2, which contains an asymmetric carbon atom. The structure of the compound is

Haloform reaction with I2 and KOH will be respond by

Which one of the following electronic arrangements is absurd?

One of the products of the following reaction is P.Structure of P is

For the reaction below, the product is Q.The compound Q is

The compound (s), capable of producing achiral compound on heating at 100\(^\circ\) is/are

The indicated atom is not a nucleophilic site in

The H - N - H angle in ammonia is 107.6\(^\circ\) while the H - P - H angle in phosphine is 93.5\(^\circ\). Relative to phosphine, the p-character of the lone-pair on ammonia is expected to be

In the equilibrium, H2 + I2 \(\rightleftharpoons\) 2HI, if at a given temperature the concentration of the reactants are increased, the value of the equilibrium constant, KC, will

Consider the following two first order reactions occurring at 298 K with same initial concentration of A :(1) A \(\to\) B; rate constant, k = 0.693 min\(-\)1(2) A \(\to\) C; half-life, t1/2 = 0.693 minChoose the correct option.

The kinetic study of a reaction like vA \(\to\) P at 300 K provides the following curve, where concentration is taken in mol dm\(-\)3 and time in min.Identify the correct order (n) and rate constant (k)

The conductivity measurement of a coordination compound of cobalt (III) shows that it dissociates into 3 ions in solution. The compound is

Compounds with spin only magnetic moment equivalent to five unpaired electrons are

The charge carried by 1 millimole of Mn+ ions is 193 coulombs. The value of n is

If electrolysis of aqueous CuSO4 solution is carried out using Cu-electrodes, the reaction taking place at the anode is

Identify the correct statement(s) :

For a van der Waals' gas, the term \(\left( {{{ab} \over {{V^2}}}} \right)\) represents some

The molecule/molecules that has/have delocalised lone pair(s) of electrons is/are

The correct order of the addition reaction rates of halogen acids with ethylene is

Which of the following mixtures will have the lowest pH at 298 K?

The conformations of n-butane, commonly known as eclipsed, gauche and anti-conformations can be interconverted by

The total number of isomeric linear dipeptides which can be synthesised from racemic alanine is

In the Bayer's process, the leaching of alumina is done by using

A copper coin was electroplated with Zn and then heated at high temperature until there is a change in colour. What will be the resulting colour?

The second ionization energy of the following elements follows the order

The melting points of (i) BeCl2 (ii) CaCl2 and (iii) HgCl2 follows the order

Which of these species will have non-zero magnetic moment?

The first electron affinity of C, N and O will be of the order

The half-life period of \({}_{53}{I^{125}}\) is 60 days. The radioactivity after 180 days will be

Consider, the radioactive disintegration \({}_{82}{A^{210}}\buildrel {} \over \longrightarrow B\buildrel {} \over \longrightarrow C\buildrel {} \over \longrightarrow {}_{82}{A^{206}}\)The sequence of emission can be

Which atomic species cannot be used as a nuclear fuel?

In the crystalline solid MSO4 . nH2O of molar mass 250 g mol\(-\)1, the percentage of anhydrous salt is 64 by weight. The value of n is

At S.T.P. the volume of 7.5 g of a gas is 5.6 L. The gas is

Which of the following chemicals may be used to identify three unlabelled beakers containing conc. NaOH, conc. H2SO4 and water?

The compound, which evolves carbon dioxide on treatment with aqueous solution of sodium bicarbonate at 25\(^\circ\)C, is

The reactive species in chlorine bleach is

For the equilibrium, H2O(l) \(\rightleftharpoons\) H2O(v), which of the following is correct?

The quantity hv/KB corresponds to

At constant pressure, the heat of formation of a compound is not dependent on temperature, when