There are 7 carbon-carbon σ bond, 5 carbon-hydrogen σ bond, 2 carbon-oxygen σ bond and 1 oxygen-hydrogen σ bond. So in total, there are 15σ bonds. There are 3 carbon-carbon π bonds and 1 carbon-oxygen π bond. So, in total there is a 4π bond.

Hence, the correct option is (A).

Valium is a tranquilizer drug. It is mainly used to treat anxiety, insomnia, and symptoms of acute alcohol withdrawal. It acts by enhancing the effects of gamma-aminobutyric acid (GABA) in the brain.

Hence, the correct option is (B).

In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge because it reduces the melting point of Bauxite (from 1200^oC to 800^o−900^oC) and also it increases the electrical conductivity of the mixture.

Hence the correct option is (B).

Genius Reaction is ,

N₂O₄(g) + 3CO(g) -----> N₂O(g) + 3CO₂(g)

we know,

heat of reaction ( ∆rH°) = ( sum of heat of formation of products ) - ( sum of heat of formation of reactants )

e.g., ∆rH° = [∆fH°(N₂O) + 3fH°(CO₂) ] - [∆fH°(N₂O₄) + 3fH°(CO) ]

Given, enthalpy of formation of CO, CO₂ , N₂O, and N₂O₄ are -110, -393 , 81 and 9.7 KJ/mol respectively .

now, ∆rH° = [81 + 3(-393)] - [9.7 + 3(-110)]

= -777.7 KJ
Hence, the correct option is (A).

The spinal fluid sample contains roughly 4 mg of glucose in 5000 mg of fluid, so the mass fraction of glucose should be a bit less than one part in 1000, or about 0.1%. Substituting the given masses into the equation defining mass percentage yields:

Hence, the correct option is (D).

Triethylenetetramine (TETA and trien), also called trientine (INN), is an organic compound with the formula [CH₂NHCH₂CH₂NH₂]₂. This oily liquid is colorless but, like many amines, assumes a yellowish color due to impurities resulting from air-oxidation. It is soluble in polar solvents.

Tetradentate ligands are ligands that bind with four donor atoms to a central atom to form a coordination complex.
Hence, the correct option is (B).

During the cyclic process, change in internal energy is zero, and no work is said to have done. As system returns to the initial state,

We know that, dH=dE+PdV, in cyclic process,dE=0 and PdV =0, Then dH=0

Hence, the correct option is (B).

For an endothermic reaction, the activation energy for the backward reaction is equal to the difference of the activation energy of the forward reaction and the enthalpy change of the reaction.

Thus, the activation energy of the reaction B→A is 50−15=35 kJ/mole

Hence, the correct option is (C).