Based on CFT, in octahedral crystal field, d orbitals split into orbitals of \(t_{2g}\) and \(e_{g}\) sets. Which d orbitals forms the \(t_{2g}\) set?

Decreasing \(Pk_b\) value of following in solution :
(A) \(CH_3CH_2NH_2\)
(B) \((CH_3CH_2)_2NH\)
(C) \((CH_3CH_2)_3N\)
(D) Aniline (Structure shown)
(E) 4-Methoxyaniline (Structure shown)
Choose the correct answer from the options given below :

Which of the following ethers cannot be prepared by bimolecular dehydration of alcohol?
(A) 2-Methoxy-2-methylpropane
(B) 2-Methoxy propane
(C) 1-Ргорохургopane
(D) 2-Ethoxy butane
Choose the correct answer from the options given below:

Read the passage given below and answer the question.
The transition 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 extreme ends stems from either too few electrons to lose or share (Sc, Ti) on too many d-electrons (hence fewer orbitals available in which to share electrons with others) for higher valence (Cu, Zn). Thus early in the series scandium (II) is virtually unknown and titanium (IV) is more stable than Ti (III) or Ti (II). At the other end, the only oxidation state of zinc is +2 (no d electrons are involved). The maximum oxidation states of reasonable stability correspond in value to the sum of the s- and d-electrons upto manganese (\(TiO_2, VVO^+, CrVIO_4^{2-}, MnVIIO_4\)) followed by a rather abrupt decrease in stability of higher oxidation states, so that the typical species to follow are \(Fe^{II,III}, Co^{II,III}, Ni^{II}, Cu^{I,II}, Zn^{II}\).
The variability of oxidation states, a characteristic of transition elements, arises out of incomplete filling of d-orbitals in such a way that their oxidation states differ from each other by unity, e.g. \(V^{II}, V^{III}, V^{IV}, V^{V}\). This is in contrast with the variability of oxidation states of non transition elements where oxidation states normally differ by a unit of two.
An interesting feature in the variability of oxidation states of the d-block elements is noticed among the groups (groups 4 through 10). Although in the p-block, the lower oxidation states are favoured by the heavier members (due to inert pair effect), the opposite is true in the groups of d-block. For example, in group 6, Mo(VI) and W(VI) are found to be more stable than Cr(VI). The Cr(VI) in the form of dichromate in acidic medium is a strong oxidising agent, whereas \(MoO_3\) and \(WO_3\) are not.
Low oxidation states are found when a complex compound has ligands capable of \(\pi\)-acceptor character in addition to the \(\sigma\)-bonding. For example, in \(Ni(CO)_4\) and \(Fe(CO)_5\), the oxidation state of nickel and iron is zero.
The elements giving minimum number of oxidation states are in extreme left and right in 3d series.
This is because :

Which solutions will have the highest boiling point?

The reaction of two molecules of 1-chlorobenzene with sodium metal in the presence of dry ether to form diphenyl is known as

The compound resistant to oxidation is

Read the passage carefully and answer the questions given along
Our immune system plays the major role in preventing diseases when we are exposed to disease-causing agents. Immunity is of two types: (i) Innate immunity and (ii) Acquired immunity. The human immune system consists of lymphoid organs, tissues, cells and soluble molecules like antibodies. The immune system also plays an important role in allergic reactions, auto-immune diseases and organ transplantation. The primary lymphoid organs are bone marrow and thymus. The secondary lymphoid organs are spleen, lymph nodes, tonsils, Peyer's patches of small intestine and appendix. There is lymphoid tissue also located within the lining of the major tracts (respiratory, digestive and urogenital tracts) called mucosa associated lymphoid tissue (MALT). It is important to note that HIV/AIDS is not spread by mere touch or physical contact; it spreads only through body fluids. AIDS has no cure, prevention is the best option. Adolescence is accompanied by several biological and behavioural changes and surveys and statistics show that use of drugs and alcohol has been on the rise especially among the youth. Factors associated with drug and alcohol abuse among adolescents are a child's natural curiosity, stress, the perception among youth that it is 'cool' or progressive to smoke, media exposure and an unstable or unsupportive family structures and peer pressure. It is best to identify the situations that may push an adolescent towards use of drugs or alcohol, and to take remedial measures well in time.
Active immunization is most suitable method for:

Match the catalysts given in List - I with the process catalyzed by them given in List - II

List - I (Catalyst)	List - II (Process)
(A) Ni in presence of Hydrogen	(I) Ziegler Natta Catalyst
(B) Finely divided iron	(II) Vegetable oil to ghee
(C) \(TiCl _4+ Al \left( CH _3\right)_3\)	(III) Sandmeyer reaction
(D) \(Cu _2 Cl _2\)	(IV) Haber's process

Choose the correct answer from the options given below:

Genes which code for a pair of contrasting traits are

In gel electrophoresis the separated DNA fragments can be visualised:

Optically active alkyl halide undergoing S_N2 substitution involves

The cotyledon in the seed of grass family is called :