Explanation

The primary linkages between a substrate molecule and an enzyme's active site are weak, non-covalent bonds.

These include hydrogen bonds, ionic bonds, and Van der Waals interactions.

The correct answer is Hydrogen bonding is a fundamental type of non-covalent interaction involved in this process. 

Explanation

- Hexokinase is an enzyme that catalyzes the phosphorylation of glucose to glucose-6-phosphate in glycolysis.

- It requires Mg²⁺ (magnesium ion) as a cofactor (activator),

- This helps in the binding of ATP by stabilizing its negative charges.

Explanation

The correct decreasing order of reactivity is Alkene > Alkynes > Alkanes. 

Alkynes:

• These have the most reactive π bonds due to the triple bond between carbon atoms, making them susceptible to a wide range of reactions. 

Alkenes:

• They have one π bond, making them less reactive than alkynes but still more reactive than alkanes. 

Alkanes:

• Alkanes only have single bonds, which are the least reactive of the three.
• They are saturated and require more energy to break the bonds for a reaction to occur. 

Explanation

Optical isomerism occurs when a molecule has a chiral center — a carbon atom attached to four different groups.

2-Hydroxy propanoic acid (Lactic acid)  

- The central carbon is bonded to:

  - –OH

  - –H

  - –CH3

  - –COOH  

=> All four groups different → chiral center present →  Optical isomerism

Explanation

2-pentanone and 3-pentanone are examples of positional isomers

Because they have the same molecular formula but differ in the position of the functional group, the carbonyl (C=O) group, which is on the second carbon in 2-pentanone and on the third carbon in 3-pentanone. 

Explanation

The factor that does not depend on the rate of evaporation is "Amount of liquid". 

While more liquid means there are more molecules available to evaporate,

The rate of evaporation is solely determined by the exposed surface area, temperature, and intermolecular forces of the liquid, not the total quantity. 

Explanation

Bond Order (B.O) is calculated using the formula:

Bond Order = ½ (Number of Bonding Electrons − Number of Antibonding Electrons)

- It tells us the strength and stability of a bond.

- Higher bond order = stronger bond.

- If bond order = 0 → No bond is formed.

Explanation

The oxidation number of Cl in HClO₂ is +3

This is calculated by assigning an oxidation number of +1 to hydrogen, -2 to each oxygen atom,

And then determining the value of chlorine (x) such that the total sum of oxidation numbers in the neutral HClO₂ molecule is zero:

(+1) + x + 2(-2) = 0, which simplifies to x = +3. 

Explanation

 Burning of methane is an exothermic reaction.

An exothermic reaction releases energy, often in the form of heat. 

Burning of methane (CH4):

• This is a combustion reaction where methane reacts with oxygen to produce carbon dioxide, water, and a significant amount of heat energy.
• All combustion reactions are exothermic.

Explanation

A spontaneous process or reaction occurs naturally without the continuous input of external energy.

While some spontaneous reactions may require an initial activation energy to get started, they continue on their own once initiated. 

Emission of α-particles from polonium:

• This is an example of radioactive decay, a nuclear process.
• Radioactive decay is inherently spontaneous because it is the process by which an unstable atomic nucleus releases energy and radiation to become more stable, and it occurs without external intervention.