JEE Main entrance exam Question Bank Solutions

\[\begin{array}{cc}
\ce{D}\phantom{........................}\\
|\phantom{.........................}\\
\ce{2D - C = O + OH^- ->[Cannizzaro] X and Y}
\end{array}\]

(Y is alcohol, D is deuterium)

X and Y will have the structure:

In the Cannizzaro reaction given below:

\[\ce{2Ph-CHO ->[OH^-] Ph-CH2OH + PhC\overset{-}{O}_2}\]

the slowest step is:

The first and second dissociation constants of an acid H₂A are 1.0 × 10⁻⁵ and 5.0 × 10⁻¹⁰ respectively. The overall dissociation constant of the acid will be ______.

Benzene on nitration gives nitrobenzene in presence of HNO₃ and H₂SO₄ mixture, where ______.

Which of the following would not give 2-phenylbutane as the major product in a Friedel-Crafts alkylation reaction?

Complete combustion of 750 g of an organic compound provides 420 g of CO₂ and 210 g of H₂O. The percentage composition of carbon and hydrogen in organic compound is 15.3 and ______ respectively. (Round off to the Nearest Integer).

These are physical properties of an elements.

1. Sublimation enthalpy
2. Ionisation enthalpy
3. Hydration enthalpy
4. Electron gain enthalpy

The total number of above properties that affect the reduction potential is ______. (Integer answer)

What would be the product when neopentyl chloride reacts with sodium ethoxide?

The relative order of reactivity of acyl derivatives is:

The process with negative entropy change is ______.

A reaction at 1 bar is non-spontaneous at low temperatures but becomes spontaneous at high temperatures. Identify the correct statement about the reaction among the following.

Using the rules for significant figures, the correct answer for the expression `(0.02858 xx 0.112)/(0.5702)` will be ______.

Functional groups Y, –CH = CH₂ and X respectively are ______ and ______ directing.

For the cell process:

\[\ce{Sn(s) + Pb^{+2}(aq) -> Pb(s) + Sn^{+2}(aq)}\]

The ratio of Pb⁺² to Sn⁺² ion concentration for spontaneity is ______.

Given: `"E"_("Sn"^(2+)//"Sn")^0` = − 0.136 V, `"E"_("Pb"^(2+)//"Pb")^0` = − 0.126 V

The major aromatic product C in the following reaction sequence will be:

For the reaction \[\ce{A(g) -> B(g)}\], the value of equilibrium constant at 300 K and 1 atm is equal to 100.0. The value of Δ_rG for the reaction at 300 K and 1 atm in J mol⁻¹ is −xR, where x is ______. (Rounded-off to the nearest integer)

[R = 8.31 J mol⁻¹ K⁻¹ and ln 10 = 2.3]

Assertion A: Sharp glass edge becomes smooth on heating it upto its melting point.

Reason R: The viscosity of glass decreases on melting.

Choose the most appropriate answer from the options given below.

An ionic solid AB₂ isomorphous to the rutile structure (a tetragonal system with the effective number of formula units = 2) has edge lengths of the unit cell of 4Å, 4Å and 7Å. The density of the substance is ______ mg/cc. (if its formula weight is 80. The N_A = 6 × 10²³ and express your answer in mg/cc using four significant digits.)

Ozone on reacting with KI in a neutral medium produces ______.

To produce 1,4-dicyanobutane following reduction is carried out:

\[\ce{2CH2 = CH - CN + 2H+ + 2e- -> NC - (CH2)4) - CN}\]

The current ______ (in Ampere) must be used to produce 162 g of 1, 4-dicyanobutane per hour.