Hydrogenation of an alkyne will add hydrogen across the triple bond, converting it to an alkene.

Alkynes can be prepared by the dehydrohalogenation of alkyl halides.

Carboxylic acids can be prepared by the hydrolysis of esters.

Respiration is an exothermic reaction that releases energy, resulting in a negative enthalpy change.

The decomposition of hydrogen peroxide is non-spontaneous under standard conditions, resulting in a positive ΔG.

Sublimation of dry ice (solid CO2 to gas) has a positive ΔH (endothermic) and a positive ΔS (increase in disorder).

The combustion of propane releases a large amount of energy, resulting in the highest enthalpy change among the options.

The combustion of glucose is a redox reaction where glucose is oxidized.

Alkanes undergo free radical substitution reactions, especially in the presence of halogens.

Alkenes undergo electrophilic addition reactions due to the presence of a double bond.

Aromatic compounds typically undergo electrophilic substitution reactions rather than addition reactions due to their stable aromaticity.

The decomposition of liquid water into gaseous hydrogen and oxygen increases the number of gas molecules, leading to a positive change in entropy.

The combustion of hydrocarbons is highly exothermic and typically has a negative ΔG, indicating spontaneity.

Alkenes typically undergo addition reactions rather than substitution reactions.

A reaction with ΔH < 0 and ΔS > 0 is spontaneous at all temperatures because it results in a negative ΔG.

Endothermic reactions with positive ΔS can have a negative ΔG at high temperatures due to the TΔS term becoming significant.

Dissolving sugar in water is a physical change as it does not alter the chemical composition of sugar.

Dissolving ammonium nitrate in water absorbs heat, making it an endothermic reaction.

All the given relationships are correct and represent the conversion between moles, mass, and molar mass.

The correct relationship is mass = moles × molar mass.

The enthalpy change for a reaction at constant pressure is represented by ΔH.

Avogadro's number is 6.022 x 10^23, which represents the number of particles in one mole.

Lithium has the highest melting point among the alkali metals due to its small size and strong metallic bonding.

Mercury is a liquid at room temperature, but it is not an s-block element; however, among the options, it is the only liquid.

Sodium, calcium, and potassium are all essential s-block elements for human health, playing vital roles in various physiological processes.

Magnesium forms a protective oxide layer that prevents further oxidation.

Lithium is widely used in batteries, especially in rechargeable lithium-ion batteries.

Lithium is the least reactive among the alkali metals.

Rubidium is the most reactive among the s-block elements listed.

Lithium is the least reactive among the alkali metals.