WB JEE 2018

The number of alkene (s) which can produce 2-butanol by the successive treatment of (i) B2H6 in tetrahydrofuran solvent and (ii) alkaline H2O2 solution is

Methoxybenzene on treatment with HI produces

$$\mathop {{C_4}{H_{10}}O}\limits_{(N)} \mathop {\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{{H_2}S{O_4}}^{{K_2}C{r_2}{O_7}}} }\limits_{} {C_4}{H_8}O\mathop {\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{Warm}^{{I_2}/NaOH}} }\li...

The correct order of reactivity for the addition reaction of the following carbonyl compounds with ethylmagnesium iodide is

\([P]\buildrel {B{r_2}} \over \longrightarrow {C_2}{H_4}B{r_2}\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{N{H_3}}^{NaN{H_2}}} [Q]\)$$[Q]\mathrel{\mathop{\kern0pt\longrightarrow}
\limits_{H{g^{2 + }},\Delta }^{20\% /{H_2}S{O_4}}} [R]...

Which of the following electronic configuration is not possible?

The number of unpaired electrons in Ni (atomic number = 28) are

The ease of hydrolysis in the compounds CH3COCl(I), CH3 \(-\) CO \(-\) O \(-\) COCH3 (II), CH3COOC2H5 (III) and CH3CONH2 (IV) is of the order

Identify 'M' in the following sequence of reactions

The possible product(s) to be obtained from the reaction of cyclobutyl amine with HNO2 is/are

If aniline is treated with conc. H2SO4 and heated at 200\(^\circ\)C, the product is

Which of the following has the strongest H-bond?

Which statements are correct for the peroxide ion?

The following equilibrium constants are given\({N_2} + 3{H_2}\) \(\rightleftharpoons\) \(2N{H_3}\); \({K_1}\)\({N_2} + {O_2}\) \(\rightleftharpoons\) \(2NO\); \({K_2}\)\({H_2} + {1 \over 2}{O_2}\) \(\rightleftharpoons\) \({H_2}O\); $${K_3}$...

The main reason that SiCl4 is easily hydrolysed as compared to CCl4 is that

Silver chloride dissolves in excess of ammonium hydroxide solution. The cation present in the resulting solution is

Ferric ion forms a Prussian blue precipitate due to the formation of

At room temperature, the reaction between water and fluorine produces

\([X] + Dil.\,{H_2}S{O_4} \to [Y]:\) Colourless, suffocating gas\([Y] + {K_2}C{r_2}{O_7} + {H_2}S{O_4} \to\) Green colouration of solution.Then, [X] and [Y] are

What amount of electricity can deposit 1 mole of Al metal at cathode when passed through molten AlCl3 ?

Given the standard half-cell potentials (E\(^\circ\)) of the following as\(\matrix{ {Zn \to Z{n^{2 + }} + 2{e^ - };} & {{E^o} = + 0.76V} \cr {Fe \to F{e^{2 + }} + 2{e^ - };} & {{E^o} = 0.41V} \cr }\)Then the standard e.m.f. of...

The number of possible organobromine compounds which can be obtained in the allylic bromination of 1-butene with N-bromosuccinimide is

CH3 \(-\) C \(\equiv\) C MgBr can be prepared by the reaction of

The major products obtained in the following reaction is/are

Equal weights of ethane and hydrogen are mixed in an empty container at 25\(^\circ\)C. The fraction of total pressure exerted by hydrogen is

Out of the following outer electronic configurations of atoms, the highest oxidation state is achieved by which one?

Which one of the following is a condensation polymer?

The half-life of C14 is 5760 years. For a 200 mg sample of C14, the time taken to change to 25 mg is

The nucleus \(_{29}^{64}\)Cu accepts an orbital electron to yield,

A compound formed by elements X and Y crystallises in the cubic structure, where X atoms are at the corners of a cube and Y atoms are at the centre of the body. The formula of the compounds is

How many moles of electrons will weigh one kilogram?

A metal M (specific heat 0.16) forms a metal chloride with 65% chlorine present in it. The formula of the metal chloride will be

Cl2O7 is the anhydride of

Which of the following is present in maximum amount in 'acid rain'?

Which of the set of oxides are arranged in the proper order of basic, amphoteric, acidic?

White phosphorus P4 has the following characteristics

Which of the following is least thermally stable?

The heat of neutralisation of a strong base and a strong acid is 13.7 kcal. The heat released when 0.6 mole HCl solution is added to 0.25 mole of NaOH is

During a reversible adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature. The ratio \({{{C_p}} \over {{C_v}}}\) for the gas is

Among the following, the extensive variables are

A ladder 20 ft long leans against a vertical wall. The top end slides downwards at the rate of 2 ft per second. The rate at which the lower end moves on a horizontal floor when it is 12 ft from the wall is

A particle is in motion along a curve 12y = x3. The rate of change of its ordinate exceeds that of abscissa in

The normal to the curve \(y = {x^2} - x + 1\), drawn at the points with the abscissa \({x_1} = 0\), \({x_2} = - 1\) and \({x_3} = {5 \over 2}\)

The law of motion of a body moving along a straight line is x = \({1 \over 2}\) vt. x being its distance from a fixed point on the line at time t and v is its velocity there. Then

Let \(f(x) = \cos \left( {{\pi \over x}} \right),x \ne 0\), then assuming k as an integer,

If n is even positive integer, then the condition that the greatest term in the expansion of (1 + x)n may also have the greatest coefficient, is

The number (101)100 \(-\) 1 is divisible by

If one of the diameter of the circle, given by the equation x2 + y2 + 4x + 6y \(-\) 12 = 0, is a chord of a circle S, whose centre is (2, \(-\) 3), the radius of S is

A chord AB is drawn from the point A(0, 3) on the circle x2 + 4x + (y \(-\) 3)2 = 0, and is extended to M such that AM = 2AB. The locus of M is

The angle between a pair of tangents drawn from a point P to the circle x2 + y2 + 4x \(-\) 6y + 9sin2\(\alpha\) + 13cos2\(\alpha\) = 0 is 2\(\alpha\). The equation of the locus of the point P is