Identify the final product \((C)\) in the reaction given below:
\(CH _3 CH _2 I + NaCN \rightarrow A \rightarrow\) (Partial hydrolysis \(\left./ OH ^{-}\right) \rightarrow b + NaOH + Br _2 \rightarrow C ?\)

Calculate the emf of the following cell at 298 K if \(E_{\text {Cell }}^{\circ}=1.10 \mathrm{~V}:\)
\(\mathrm{Ni}(\mathrm{s})+2 \mathrm{Ag}^{+}(0.2 \mathrm{M}) \rightarrow \mathrm{Ni}^{2+}(0.04 \mathrm{M})+2 \mathrm{Ag}(\mathrm{s})\)

Benzene ring in phenol is expected to give the characteristic substitution or replacement reactions i.e. halogenation, nitration, sulphonation, alkylation etc. In these reactions, the attacking reagent is electrophile. The phenolic group activates the ortho and para positions in the ring due to conjugation. Disubstitution reactions are quite fast as the electron density in the ring has increased considerably. Phenols do not respond to nucleophilic substitution reactions as it is influenced by phenolic group.

Select the correct statement.

Van Arkel Method is used for -

In neutral or mild alkaline solutions, potassium permanganate oxidizes manganous salt \(\left( Mn ^{2+}\right)\) to ______________?

Read the passage carefully and answer the questions
Amines are considered as derivatives of ammonia obtained by replacement of hydrogen atoms with alkyl or aryl groups. In nature they occur among proteins, vitamins, alkaloids and hormones. These can be primary, secondary or tertiary depending on the number of hydrogen groups replaced. They can be prepared from nitro compounds, alkyl halides, nitriles, amides etc. Due to unshared pair of electrons they behave as Lewis bases. Influence of the number of hydrogen atoms at nitrogen atom is displayed in physical properties such as solubility, boiling point and chemical reactions including basicity. Basic character of amines is expressed in terms of their \(K_b\) and \(p K_b\) values. Three classes of amines can be distinguished with p-toluene sulphonyl chloride which reacts with primary and secondary ddu amines. Amino group when attached to benzene ring behaves as an activating and ortho para directing group.
Which of the following reaction is not given by aniline?

Two charged particles, placed at a distance d apart in vacuum, exert a force F on each other. Now, each of the charges is doubled. To keep the force unchanged, the distance between the charges should be changed to :

Which of the following in NOT true for Bt toxin ?
(A) It is produced by Bacillus thuringiensis
(B) It is produced in active form
(C) It exist as inactive protoxin
(D) It is used to produce nematode-resistant plants
Choose the correct answer from the options given below :

Internal resistance of a cell is:
A. decreases with increase in the distance between electrodes.
B. increases with increase in the area of electrodes inside electrolyte.
C. decreases with increase in temperature.
D. doesn't depend on the concentration of the electrolyte.
Choose the correct answer from the options given below:

A galvanic cell behaves as electrolytic cell when?

Answer the question on the basis of passage given below:
One of the notable features of the transition element is the great variety of oxidation states it may show in its compounds. The elements which give the greatest number of oxidation states occur in or near the middle of the series. Manganese, for example exhibits all the oxidation states from 2 to +7. The lesser number of oxidation states at the extreme ends is either due to losing or sharing of few electrons (Se, Ti) or too many d electrons of higher valence. Early in the first series scandium (II) is virtually unknown and titanium (IV) which is more stable than Ti (III) or Ti (II). On the other end, the only oxidation state of zinc is \(+ 2\).
Ambidentate ligand among the following is
A. NCS
B. \(C _2 O _4^{2-}\)
C. SCN
D. \(H _2 NCH _2 CH _2 NH _2\)
E. \(NO _2\)
Choose the correct answer from the options given below:

The mean of the number of heads in a simultaneous toss of three coins is