The order of stability of carbocation can also be explained by assuming that alkyl groups bonded to a positively charged carbon release electron density toward that carbon and help delocalize the positive charge on the cation. Thereby, the electron releasing ability of alkyl groups bonded to a cationic carbon is considered by two effects, inductive effect, and hyper-conjugation.

S > R > Q > P > T is correct sequence

Hence, the correct option is (D).

The circuit where the current is not flowing, its resistance is infinite. It is called an open circuit. The circuit of the generator is an open circuit, thus the circuit of a switchless and load-less socket is an open circuit. The electric carrier at the connective ends of the open circuit. The potential exists but due to the circuit opening, the current flow value is zero.

By the given circuit, the potential difference across A and B is 20 V because cell is in open circuit.

Hence, the correct option is (D).

Newton's first law of motion is also known as the law of inertia. Newton's First Law states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an external force. It may be seen as a statement about inertia, that objects will remain in their state of motion unless a force acts to change the motion.

Hence, the correct option is (A).

Links between organisms that show branching pattern of evolutionary relationships are shown by phylogenetic tree.

A phylogenetic tree is a diagram that represents evolutionary relationships among organisms. The pattern of branching in a phylogenetic tree reflects how species or other groups evolved from a series of common ancestors.

Hence, the correct option is (C).

Sequence of energy levels of molecular orbitals is not correct for the remaining molecules Li₂,Be₂,B₂,C₂,N₂

For instance, it has been observed experimentally that for molecules such as B₂,C₂,N₂ etc.

The increasing order of energies of various molecular orbitals is

The important characteristic feature of this order is that the energy of σ2pz molecular orbital is higher than that of π2p_x and π2p_y molecular orbitals.

Hence, the correct option is (A).

Cerium (III) Sulfate which unlike Cesium Sulfate does decrease solubility at higher temperatures. This is pretty much a trait of anything that is a gas at room temperature. This is actually where the air bubbles in boiling water come from. As the temperature increases the previously dissolved water rises and escapes from the solution until by point the water itself starts to evaporate almost all if the air is gone. Cerium Sulfate is the same. It is less soluble at higher temperatures.

Ce₂(SO₄)₃ solubility decrease with an increase in temperature.

Hence, the correct option is (A).

Annelida possess true coelom. Their coelom is schizocoelic in origin (i.e., it is formed by the splitting of embryonic mesoderm), thus they can also be called schizocoelomata. Phylum Echinodermata and Chordata have enterocoelom, where the coelom is formed by the splitting of endoderm.

Hence, the correct option is (A).

Here compound A₃ (BC₄)₂ is possible as in it sum of oxidation numbers is zero as follows:

3(+2)+2 × 5+8(−2) = 0

Hence, the correct option is (B).

(A) Molisch's test is a chemical test which is used to check for the presence of carbohydrates in a given analyte.

(B) The biuret test, also known as Piotrowski's test, is a chemical test used for detecting the presence of peptide bonds. In the presence of peptides, a copper (II) ion forms mauve-colored coordination complexes in an alkaline solution.

(C) Fehling’s test is used for reducing sugars and non-reducing sugars, supplementary to the Tollens’ reagent test. The test was developed by German chemist Hermann von Fehling in 1849.

(D) Millon's reagent is an analytical reagent used to detect the presence of soluble proteins.

Hence, the correct option is (C).