NESA Chemistry Alcohols

Esters cannot form intermolecular hydrogen bonds, resulting in weaker dipole-dipole interactions and a lower boiling point compared to alcohols and carboxylic acids.

While alcohols can form hydrogen bonds, they do not form stable dimers like carboxylic acids do, resulting in slightly weaker overall intermolecular forces and a lower boiling point than option B.

Amines can form hydrogen bonds, but because nitrogen is less electronegative than oxygen, the N-H bond is less polar than the O-H bond. This makes their hydrogen bonds weaker than those in alcohols and carboxylic acids.

This answer is incorrect and likely results from a calculation error, such as miscalculating the moles of propan-1-ol or the heat absorbed by the water.

This answer is incorrect and may result from using an incorrect molar mass for propan-1-ol ($C_3H_8O$, $60.1 \text{ g mol}^{-1}$) or a rounding error early in the calculation.

This answer is incorrect and likely stems from an error in calculating the temperature change ($\Delta T = 18.5 ^\circ\text{C}$) or the heat energy transferred.

While both fuels produce the same amount of greenhouse gases (1 mole of $\text{CO}_2$ per mole of fuel), they produce a different number of electrons during oxidation.

This is incorrect because they produce the same amount of greenhouse gases (1 mole of $\text{CO}_2$ per mole of fuel) and a different number of electrons.

This is incorrect because they produce the same amount of greenhouse gases, as both fuels contain exactly one carbon atom per molecule and thus yield the same amount of $\text{CO}_2$.

Pentanal ($CH_3CH_2CH_2CH_2CHO$) is a valid product formed by the partial oxidation of pentan-1-ol, which is a primary alcohol.

Carbon dioxide ($CO_2$) is a valid product of the complete oxidation (combustion) of pentan-1-ol.

Pentanoic acid ($CH_3CH_2CH_2CH_2COOH$) is a valid product formed by the full oxidation of pentan-1-ol using a strong oxidizing agent.

This is incorrect because biodiesel is derived from renewable biomass and generally produces fewer net carbon emissions and particulates compared to fossil-fuel-derived petrodiesel.

This is incorrect because while petrodiesel consists of non-polar hydrocarbons, biodiesel consists of fatty acid methyl esters which contain polar ester groups.

This is incorrect because biodiesel has a higher cloud point than petrodiesel, meaning it is more prone to gelling and restricting flow in very cold climates.

This order represents the highest to lowest retention time, which would be the correct order if the stationary phase were polar (normal-phase HPLC).

Hexane is the most non-polar compound, meaning it will interact most strongly with the non-polar stationary phase and have the highest, not lowest, retention time.

While hexane correctly has the highest retention time, hexan-1-ol is more polar than hexan-2-one due to its ability to form hydrogen bonds, so hexan-1-ol will elute before hexan-2-one.

This equation is incorrect because combustion reactions of hydrocarbons and alcohols produce water ($\text{H}_2\text{O}$), not hydrogen gas ($\text{H}_2$).

This equation is incorrect because it produces carbon dioxide ($\text{CO}_2$), which is a product of complete combustion, and hydrogen gas ($\text{H}_2$) instead of water.

This equation represents the complete combustion of ethanol, which produces carbon dioxide ($\text{CO}_2$) rather than the carbon monoxide ($\text{CO}$) produced during incomplete combustion.

Solvent extraction relies on differences in solubility, which would likely be ineffective here since both ethanol and the other compounds are polar and may dissolve in similar solvents.

Simple distillation is only effective for separating liquids with significantly different boiling points (typically a difference of at least 25°C).

Adding solvent extraction is unnecessary and less efficient, as fractional distillation alone is the standard and most effective method for separating liquids with similar boiling points.

This is a nitrile (propanenitrile). Nitriles are typically synthesized by reacting haloalkanes with cyanide ions, not by reacting oxidation products of alcohols with amines.

This is a primary amine with three carbons. The reaction sequence does not add carbon atoms to the chain, nor does it reduce a functional group to a primary amine.

This is an amino acid (alanine). The reaction produces a simple amide from a carboxylic acid and an amine, not a molecule with both amine and carboxylic acid functional groups on the same carbon.

This formula is incorrect because a triglyceride must contain 6 oxygen atoms, not 3, and the carbon and hydrogen counts do not balance the transesterification reaction.

This formula is incorrect because it fails to account for the 3 carbon atoms from the glycerol backbone, resulting in 54 carbons instead of 57.

This formula is incorrect because a triglyceride contains 3 ester groups, meaning it must have 6 oxygen atoms, not 3.

This is incorrect. Using 1 mole of $\mathrm{O_2}$ would only provide 3 oxygen atoms on the reactant side, which is not enough to balance the carbon and hydrogen atoms in the products.

This is incorrect. Using 2 moles of $\mathrm{O_2}$ provides 5 oxygen atoms on the reactant side, which is insufficient to form the required $2\mathrm{CO_2}$ and $3\mathrm{H_2O}$ molecules.

This is incorrect. Using 4 moles of $\mathrm{O_2}$ would result in 9 oxygen atoms on the reactant side, which is more than the 7 oxygen atoms needed for the products.

While catalysts do lower the activation energy required, they function to speed up the reaction, not slow it down.

Catalysts lower the activation energy required for the reaction to occur, rather than requiring more energy.

This is incorrect because catalysts lower the activation energy and increase the rate of reaction.

Bromine water is used to test for the presence of carbon-carbon double bonds (unsaturation). It would not react with either of these saturated alcohols.

Potassium nitrate is generally unreactive with alcohols and would not produce a visible change to help distinguish between the two substances.

Sodium carbonate is typically used to test for acidic substances like carboxylic acids by observing effervescence (carbon dioxide gas), but it does not react with alcohols.