With reference to Arrhenius equation \(k=A e^{-E_a / R T}\)

Which statement is/are true for Gabriel phthalimide synthesis?
A. It is used for the preparation of primary and secondary amines
B. It is only used for the preparation of primary amines
C. Aromatic primary amines can not be prepared by this method
D. Only tertiary amines can be prepared
Choose the correct answer from the options given below:

Answer the question on the basis of passage given below :
There are three kinds of amines which are primary, secondary and tertiary amines. These amines may have alkyl group or aryl group or both alkyl and aryl groups. These amines can be distinguished from one another by various chemical tests.
An amine A on treatment with \(\text{NaNO}_2\) and \(\text{HCl}\) at 273-277 K, followed by treatment with ethyl alcohol, gives a compound B with empirical formula CH and molecular mass 78.
A is :

The reagents involved in the following conversion are

Pick the reactions which can be used to distinguish between n-propyl alcohol and isopropyl alcohol.
(A) Haloform reaction
(B) Dehydration
(C) Dehydrogenation with \(\mathrm{Cu} / 573 \mathrm{~K}\)
(D) Oxidation with \(\mathrm{CrO}_3\)
Choose the correct answer from the options given below:

Which of the following compounds will give a pair of enantiomers upon nucleophilic substitution reaction with a hydroxide ion?

Isomerism shown by \(Co(NH_3)_3(NO_2)_3\) is

\( E_1 \) and \( E_2 \) represents potential and kinetic energies of the orbital electron respectively then:

Let y be a discrete random variable, taking values \(y_1, y_2, y_3, ..., y_n\) with probabilities \(p_1, p_2, p_3, ..., p_n\) respectively. Then the standard deviation of y is given by:

The speed of electromagnetic waves in a material medium is given by (symbols have their usual meanings):

A straight wire of mass 500 g and length 7 m carries a current of 1.4 A. It is suspended in mid air by a uniform horizontal magnetic field B perpendicular to the length of the wire. The magnitude of magnetic field is:

An airliner is flying due east from the USA to France. The Earth's magnetic field acts at \( 60^{\circ} \) to the horizontal and has a strength of \( \sqrt{3} \times 10^{-4} \, \text{T} \), and the aircraft speed is \( 300 \, \text{ms}^{-1} \). The wing span of the aircraft is 60 m. The potential difference induced between the tips of the wings is :

Read the following passage carefully and answer the given questions.
Restriction endonuclease on finding its specific recognition sequence, bind to the DNA and cut each of the two strands of the double helix at specific points in their sugar -phosphate backbones. Each restriction endonuclease recognises a specific palindromic nucleotide sequences in the DNA. Since the DNA is enclosed within the membranes, we have to break the cell open to release DNA along with other macromolecules such as RNA, proteins, polysaccharides and also lipids. This can be achieved by treating the bacterial cells/plant or animal tissue with enzymes such as lysozyme (bacteria), cellulase (plant cells), chitinase (fungus). Now a days the most commonly used matrix is agarose which is a natural polymer extracted from sea weeds. The DNA fragments separate (resolve) according to their size through sieving effect provided by the agarose gel. The first restriction endonuclease-Hind II, whose functioning depended on a specific DNA nucleotide sequence was isolated and characterised five years later. It was found that Hind II always cut DNA molecules at a particular point by recognising a specific sequence of six base pairs. In addition to 'ori', the vector requires a selectable marker, which helps in identifying and eliminating non-transformants and selectively permitting the growth of the transformants. Transformation is a procedure through which a piece of DNA is introduced in a host bacterium. Normally, the genes encoding resistance to antibiotics such as ampicillin, chloramphenicol, tetracycline or kanamycin, etc., are considered useful selectable markers for E. coli
Chitinase is used to disrupt the membranes of: