Propene on addition with bromine in CCl4 gives

Arrange the following elements in decreasing order of their radii:
(A) La
(B) Pr
(C) Gd
(D) Yb
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When a metal is placed in a solution of its ions, the metal can lose electron and can go in the solution as ion or the metal ion in the solution can take electron from the electrode and get deposited as metal. Thus, the electrode acquires either positive or negative charge with respect to the solution leading to the development of a potential difference between the metal electrode and the solution. This potential difference is called the electrode potential of the metal. The electrode potential of a metal is a measure of relative tendency to undergo oxidation (loss of electron) or reduction (gain of electron). When the concentration of the ions in the solution is unity, the electrode potential is called standard electrode potential. The magni of potential depends upon the nature of electrode, concentration of ions in solution and the temperature. In a galvanic cell, the electrode at which oxidation occurs is known as anodic half-cell and the electrode at which reduction occurs is known as cathodic half cell. The emf of the cell in terms of standard reduction potential is given by \(E_{\text {cell }}^{\circ}=E_{\text {cathode }}^{\circ}-E_{\text {anode. }}^{\circ}\).The standard free energy change of the redox reaction taking place in the cell is related to \(E_{\text {cell }}^{\circ}\) by \(\Delta G^{\circ}=-n F E^{\circ}\). A redox reaction would occur spontaneously if the free energy change is negative. The equilibrium constant of the reaction is related to the standard free energy change by \(\Delta G^{\circ}=-R T \ln K\).
The standard reduction potential of Zinc is represented by the reaction

Match List - I with List - II

List - I	List - II
(A) Molarity	(I) Number of moles of solute / kilogram of solvent
(B) Molality	(II) Osmotic pressure
(C) Colligative property	(III) Number of moles of solute / litre of solution
(D) Non-ideal solution	(IV) Deviation from Raoult's Law

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Amines are considered to be derivatives of ammonia obtained by replacement of hydrogen atoms with alkyl or aryl groups. They are usually prepared from nitro compounds, halides, amides, imides etc. The presence of hydrogen bonding influences its physical properties. In alkylamines, a combination of electron releasing steric and hydrogen bonding factors influences the stability of substituted ammonium cations in protic polar solvents and thus affects the basic nature of amines. Alkyl amines are found to be stronger bases than ammonia which is more basic than water. Primary and secondary amines are engaged in intermolecular association due to hydrogen bonding. This intermolecular association is more in primary amines than in secondary amines. Tertiary amines do not have intermoleulcar association due to the absenceof hydrogen atom available for hydrogen bonding. Thus, the boiling point of amines depends on hydrogen bonding. In aromatic amines, electron releasing and withdrawing groups increase and decrease their basic character. Aryl diazonium salts usually obtained from arylamine undergo replacement of the diazonium group with a variety of nucleophile. Their coupling reaction of aryl diazonium salts with phenol or arylamine results in formation of dyes.
Complete the reaction by giving the final product:
Chloroethane + ethanolic (NaCN) + LiAlH\(_4\) \(\rightarrow\) ?

Un-decomposed silver bromide from developed film, in black and white photography, makes a complex with hypo. The formula of the complex is

Identify the product C in the following sequence of reactions :
\(\text{CH}_3 - \text{CH(OH)} - \text{CH}_3 \xrightarrow{\text{Cu, 573 K}} \text{A} \xrightarrow{\text{CH}_3\text{MgBr}} \text{B} \xrightarrow{\text{H}_3\text{O}^+} \text{C}\)

Match List I with List II.

LIST I	LIST II
A. Penicillium notatum	I. Ethanol
B. Trichoderma polysporum	II. Citric acid
C. Saccharomyces cerevisiae	III. Antibiotics
D. Aspergillus niger.	IV. Cyclosporin A

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Arrange the following compounds towards increasing \(S_{N}2\) reaction?
(A) n-Butyl bromide
(B) Isobutyl bromide
(C) Tertiary butyl bromide
(D) Sec-Butyl bromide
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A thin lens L1 of focal length 20 cm placed in combination with another thin lens L2 acts as a lens of focal length 12.5 cm. The power of L2 is

Match List-I with List-II

List-I (Solute)	List-II (Van't Hoff factor)
(A) Benzoic acid in benzene	(I) 3
(B) \(K _2 SO _4( aq )\)	(II) 2
(C) Urea (aq)	(III) 0.5
(D) \(KOH ( aq )\)	(IV) 1

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If the protons and electrons are the only basic charges in the universe, all the observable charges have to be integral multiples of e. Thus, if an object contains x electrons and y protons, the net charge on the object will be

Choose the correct statement(s) from the following:
(A) With increasing reverse bias voltage, the barrier potential across the junction of p-n diode decreases.
(B) A p-type semiconductor can be obtained by doping Si or Ge with trivalent atoms.
(C) A rectifier rectifies dc voltages.
(D) Pure semiconductors are called extrinsic semiconductors.
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