Organic Chemistry: Some Basic Principles and Hydrocarbons together give NEET a steady set of direct questions. This set covers IUPAC naming, structural isomers, electronic effects, reaction intermediates, nitrogen estimation and the key reactions of alkanes, alkenes, alkynes and benzene from NCERT Class 11.
How to practise: read each question and tap the option you think is correct. You will see right away whether you got it, along with a short explanation, and your score is tracked at the bottom of the screen. This set has 15 questions.
Topics covered in this set
- IUPAC naming
- Structural isomers and metamerism
- Hyperconjugation and reagents
- Carbanions and other intermediates
- Kjeldahl estimation of nitrogen
- Reactions of alkanes, alkenes, alkynes and benzene
NEET Chemistry MCQs with answers and explanations
Q1. What is the IUPAC name of (CH₃)₂C=CH–CH₃?
a) Pent-2-ene
b) 2-Methylbut-2-ene
c) 3-Methylbut-2-ene
d) 2-Methylbut-1-ene
Q2. What is the IUPAC name of HO–CH₂–CH₂–COOH?
a) 2-Hydroxypropanoic acid
b) 1-Hydroxypropanoic acid
c) 3-Carboxypropan-1-ol
d) 3-Hydroxypropanoic acid
Q3. How many structural isomers are possible for C₄H₉Cl?
a) 2
b) 3
c) 5
d) 4
Q4. Diethyl ether (C₂H₅–O–C₂H₅) and methyl propyl ether (CH₃–O–C₃H₇) are related as:
a) Position isomers
b) Functional isomers
c) Metamers
d) Chain isomers
Q5. How many α-hydrogen atoms take part in hyperconjugation in the tert-butyl carbocation, (CH₃)₃C⁺?
a) 6
b) 12
c) 9
d) 3
Q6. Which reaction intermediate has an sp³ hybridised carbon and a pyramidal shape?
a) Dichlorocarbene
b) Methyl free radical
c) Methyl carbanion
d) Methyl carbocation
Q7. Which of the following species acts as an electrophile?
a) BF₃
b) CN⁻
c) NH₃
d) H₂O
Q8. In the Kjeldahl method, the ammonia evolved from 0.5 g of an organic compound exactly neutralised 10 mL of 1 M H₂SO₄. What is the percentage of nitrogen in the compound?
a) 42%
b) 56%
c) 14%
d) 28%
Q9. Which statement about the conformations of ethane is correct?
a) The staggered form is more stable because it has the least torsional strain
b) The two forms can be separated at room temperature
c) The eclipsed form is more stable because the hydrogens are closer
d) Both forms have exactly equal energy
Q10. Sodium propanoate is heated with soda lime (NaOH + CaO). Which hydrocarbon is formed?
a) Propane
b) Butane
c) Ethene
d) Ethane
Q11. 2-Bromobutane is heated with alcoholic KOH. What is the major product?
a) But-1-ene
b) Butane
c) Butan-2-ol
d) But-2-ene
Q12. Which compound gives a white precipitate with ammoniacal silver nitrate solution?
a) But-2-yne
b) Propyne
c) Ethene
d) Ethane
Q13. Ethyne is passed into dilute H₂SO₄ containing HgSO₄ at 333 K. What is the final product?
a) Ethanal
b) Ethanoic acid
c) Ethylene glycol
d) Ethanol
Q14. What products are formed by ozonolysis of 2-methylpropene, (CH₃)₂C=CH₂, followed by Zn/H₂O?
a) Two molecules of ethanal
b) Propanal and methanal
c) Propanone only
d) Propanone and methanal
Q15. Which substituent on a benzene ring directs an incoming electrophile to the meta position?
a) –OH
b) –CH₃
c) –Cl
d) –CHO
Quick revision notes
- IUPAC: principal group gets the lowest locant; –COOH outranks –OH, which then becomes a hydroxy prefix.
- Metamers differ in the alkyl groups on either side of the same polyvalent functional group.
- Hyperconjugation count = number of α-H atoms; CH₃⁻ is sp³ pyramidal, CH₃⁺ is sp² planar.
- Kjeldahl: % N = 1.4 × M × 2V(H₂SO₄)/w; not used for nitro, azo or ring nitrogen compounds.
- Soda lime removes one carbon; alc. KOH follows Saytzeff; terminal alkynes are acidic; –CHO, –NO₂, –COOH are meta directing.
Frequently asked questions
Are these NEET previous year questions?
No. They are original practice questions based on the NCERT Class 11 chapters Organic Chemistry: Some Basic Principles and Techniques and Hydrocarbons.
What is the difference between Markovnikov and Saytzeff rules?
Markovnikov's rule predicts where H and X go when HX adds to an alkene. Saytzeff's rule predicts which alkene forms in an elimination: the more substituted one.
How do I tell activating and deactivating groups apart quickly?
Groups that donate electrons to the ring, such as –OH, –NH₂ and –CH₃, activate it. Groups that withdraw electrons, such as –NO₂, –CHO and –COOH, deactivate it; halogens deactivate but still direct ortho and para.
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