75 free MCQs on Organic Chemistry: Basic Principles and Techniques, each with its own worked answer and explanation. General Organic Chemistry covers the rules behind all organic reactions. Covers inductive effect, resonance, hyperconjugation, types of reactions (substitution, addition, elimination), and isomerism including optical and geometric forms.
Take the timed Organic Chemistry: Basic Principles and Techniques chapterwise test →75 practice questions on Organic Chemistry: Basic Principles and Techniques, sorted Easy → Hard. Try each one first, then open its answer page for the worked explanation. Want the full theory first? Read the Organic Chemistry: Basic Principles and Techniques notes.
Geometric (cis-trans) isomers of 1,2-dichloroethene differ only in the relative arrangement of groups across the rigid C=C double bond.
Q1.
Which technique is most suitable to separate two miscible liquids whose boiling points differ by only a few degrees?
Q2.
In Lassaigne's test, the organic compound is fused with a small piece of which metal?
Q3.
Steam distillation is applicable to compounds that are:
Q4.
Which of the following groups shows a +I (electron-releasing inductive) effect?
Q5.
Chromatography separates the components of a mixture mainly on the basis of their:
Q6.
What is the hybridisation of carbon in methane?
Q8.
Which bond is formed by sidewise overlap of orbitals?
Q9.
What is the hybridisation of carbon in ethene?
Q10.
Which compound shows chain isomerism?
Q11.
Which functional group is present in alcohols?
Q12.
What is the IUPAC name of CH<sub>3</sub>CH<sub>2</sub>OH?
Q13.
Compounds with the same molecular formula but different structures are called:
Q14.
What is the general formula of alkanes?
Q15.
What type of bond is present in all single covalent bonds?
Q16.
What is the hybridisation of carbon in ethyne?
Q17.
Which effect involves displacement of sigma electrons?
Q18.
Which element is the most electronegative?
Q19.
What type of isomerism is shown by ethanol and dimethyl ether?
Q20.
A homologous series differs by which group?
Q22.
Which functional group is present in aldehydes?
Q23.
What is the IUPAC name of CH<sub>3</sub>COOH?
Q24.
Which hybrid orbital arrangement gives linear geometry?
Q25.
What is the bond angle in sp<sup>2</sup> hybridisation?
Q26.
In paper chromatography, the stationary phase is:
Q27.
What is the degree of unsaturation (rings plus pi bonds) for a compound of molecular formula C<sub>6</sub>H<sub>6</sub>?
Q28.
Which of the following carboxylic acids is the strongest?
Q29.
Which of the following carbocations is the most stable?
Q30.
The acetate ion (CH<sub>3</sub>COO<sup>-</sup>) owes its stability to how many equivalent resonance structures?
Q31.
Which effect explains the stability of benzene through electron delocalisation?
Q32.
Which carbocation is most stable?
Q33.
Which species acts as an electron pair donor?
Q34.
Which intermediate contains a positively charged carbon atom?
Q35.
What is the geometry of a carbocation?
Q36.
Which effect involves complete transfer of pi electrons due to an attacking reagent?
Q37.
Which of the following is a nucleophile?
Q38.
Optical isomerism is caused by the presence of:
Q39.
Mirror image stereoisomers are called:
Q40.
Which type of isomerism is shown by cis and trans forms?
Q41.
Which carbocation is stabilised by resonance?
Q42.
Which species contains an unpaired electron?
Q43.
Which effect stabilises alkenes through overlap with adjacent sigma bonds?
Q44.
Which compound can show geometrical isomerism?
Q45.
Which of the following is an electrophile?
Q46.
Which carbanion is most stable?
Q47.
Which type of isomers are not mirror images of each other?
Q48.
The delocalisation of electrons over adjacent atoms is called:
Q49.
Which free radical is most stable?
Q50.
Which effect is permanent in nature?
Q51.
In Lassaigne's test for nitrogen, the Prussian blue colour is due to the formation of:
Q52.
In Liebig's method for estimating carbon and hydrogen, the carbon content is calculated from the mass of:
Q53.
In the Carius method, the halogen in an organic compound is estimated by precipitating it as:
Q54.
Which order correctly represents the decreasing -I (electron-withdrawing) inductive effect?
Q55.
The number of alpha-hydrogens responsible for the hyperconjugative stabilisation of the tert-butyl cation, (CH<sub>3</sub>)<sub>3</sub>C<sup>+</sup>, is:
Q56.
How many stereoisomers are possible for a compound with two chiral carbons?
Q57.
Which rule is used to assign R and S configuration?
Q58.
Which compound follows Huckel's rule for aromaticity?
Q59.
How many pi electrons are required for aromaticity according to Huckel's rule?
Q60.
Which conformation of ethane is most stable?
Q61.
Which conformation of cyclohexane is most stable?
Q62.
The interconversion between keto and enol forms is called:
Q63.
Which aromatic compound has 6 pi electrons?
Q64.
Which intermediate is most stable?
Q65.
What is the IUPAC name of CH3CH(CH<sub>3</sub>)CH<sub>2</sub>CH<sub>3</sub>?
Q66.
Which species is antiaromatic?
Q67.
Which notation is used for geometrical isomers based on CIP priority?
Q68.
What does Z configuration indicate?
Q69.
Which cyclic compound is non-aromatic?
Q70.
Ring-chain isomerism is shown by:
Q71.
Which Newman projection represents eclipsed conformation?
Q72.
Which carbocation undergoes maximum hyperconjugation?
Q73.
Which compound can exhibit tautomerism?
Q74.
What is the total number of stereoisomers possible for tartaric acid?
Q75.
Which compound is aromatic?
or take the timed test and get a score instead of just reading