OCR A-Level Chemistry A: Module 4 (Core organic chemistry) overview quiz quiz

Chain isomerism

Functional group isomerism

Position isomerism

E/Z isomerism

Heterolytic fission forming two ions

Heterolytic fission forming a carbocation

No bonds are broken

Homolytic fission forming two radicals

Trigonal planar, $120^{\circ}$

Tetrahedral, with bond angles of about $109.5^{\circ}$ around each carbon

Linear, with a bond angle of $180^{\circ}$ at each of the two carbons

Pyramidal, with bond angles of roughly $107^{\circ}$ around each carbon

It forms the more stable primary carbocation intermediate, as the rule predicts

It forms the more stable secondary carbocation intermediate

The bromide ion is a much stronger nucleophile at carbon 2 than it is at carbon 1

The pi bond of the alkene is permanently polarised towards carbon 2 before reaction

An aldehyde

A carboxylic acid

A ketone

No reaction

Warm aqueous sodium hydroxide, which substitutes the hydroxyl group

Acidified potassium dichromate(VI) under reflux, which oxidises the alcohol

Bromine water at room temperature, which adds across any double bond

Concentrated sulfuric acid (or phosphoric acid), heated

The $\text{C-I}$ bond is weaker (lower bond enthalpy) so it breaks more easily

The $\text{C-I}$ bond is far more polar than the $\text{C-Cl}$ bond, so it attracts the nucleophile

The iodide ion is a stronger nucleophile, so it attacks the carbon atom much more readily

Iodoalkanes are considerably more soluble in water, so they meet the nucleophile more often

Warm aqueous KOH, with the hydroxide acting as a nucleophile

Hot ethanolic (in ethanol) KOH

Cold dilute aqueous KOH, kept well below room temperature

KOH dissolved in propanone and kept at room temperature

The largest fragment ion formed when the molecule breaks apart in the spectrometer

The base peak, which is the tallest peak and is assigned a relative abundance of 100

The molecular ion, giving the relative molecular mass

An impurity in the sample that happens to be heavier than the compound itself

$\text{C=O}$ in a ketone, a sharp band near $1700\ \text{cm}^{-1}$

$\text{C-H}$ in an alkane, a set of bands just below $3000\ \text{cm}^{-1}$

$\text{C=C}$ in an alkene, a weak band near $1650\ \text{cm}^{-1}$

$\text{O-H}$ in an alcohol