Hydrocarbons — practice questions
75 curated practice questions from Hydrocarbons (Chemistry JEE Advanced, NTA Exams) — 56 hard, 19 medium. Every question includes the final answer free; step-by-step worked solutions with a free account.
- Assertion (A) : 1-butyne forms white precipitate with ammoniacal silver nitrate solution while 2-butyne does not…
- The reaction of toluene with chlorine in presence of ferric chloride gives predominantly
- Which of the statements are correct for alkyne with molecular formula C 6 H 10 ? (Only structural isomers)
- Schemes 1 and 2 describe sequential transformation of alkynes M and N. Consider only the major products formed in each…
- In which of the following the incorrect place for electrophilic substitution has been indicated ?
- Assertion (A) : Addition of HBr in presence of a peroxide (ROOR) to propene gives 2-bromo propane. Reason (R) …
- Which of the following reactions are correctly represented? (R is a alkyl group)
- H _ 3 C - C CH [ 2. CH _ 3 CH _ 2 Br ] 1. NaNH _ 2 ~A [ Pd ^ 2 - BaSO _ 4 ] H _ 2 ~B :
- The number of structural and configurational isomers of a bromo compound, C 5 H 9 Br, formed by the addition of HBr to…
- Assertion (A) : Hydrogenation of an alkene is always an exothermic process. Reason (R) : Alkane has lower potential…
- A tertiary alcohol H upon acid catalysed dehydration gives a product I . Ozonolysis of I leads to compounds J and K …
- Which one of the following alkenes will react fastest with H 2 under cataltic hydrogenation condition? (2000)
- Assertion (A) : Propyne is more reactive than propene towards electrophilic addition of HBr. Reason (R) : Propyne has…
- What will be formed in the following Kolbe’s electrolys is?
- A benzene ring deactivated by strong and moderate electron withdrawing group that is, any meta directing group, is not…
- Assertion (A) : Benzene does not decolourise alkaline KMnO 4 . Reason (R) : Benzene is stabilized by resonance and…
- The major product(s) of the following reaction is (are) ? array l P Q array array l R S array
- If aromatic ring is substituted by more than groups then electrophilic aromatic substitution reaction take place…
- Statement-1 : Bromobenzene upon reaction with Br 2 /Fe gives 1, 4-dibromobenzene as the major product. Statement-2 : In…
- In the following reaction, the product(s) formed is (are) ? array l (P) (Q) (R) (S) array
- The reaction of with HBr gives
- Identify the set of reagent/reaction conditions X and Y in the following set of transformations.
- The reaction of propene with HOCl proceeds via the addition of (2001)
- Which of the following alkenes is most reactive towards electrophilic addition reaction ?
- Assertion (A) : Toluene undergoes nitration much more readily than benzene. Reason (R) : It is due to electron…
- The number of possible enantiomeric pairs that can be produced during monochlorination of 2-methylbutane is
- Which of the following is incorrect regarding combustion of alkanes ?
- Identify a reagent from the following list which can easily distinguish between 1-butyne and 2-bytyne. (2002)
- The major product of the following reaction is
- Which will undergo Friedal-Craft alkylation reaction ? array l 1 array
- Which of the following is/are deactivating groups towards electrophilic aromatic substitution ?
- What would be the product formed when 1-bromo-3-chlorocyclobutane reacts with two equivalents of metallic sodium in…
- Assertion (A) : 1-butene on reaction with HBr in the presence of a peroxide produces 1-bromobutane. Reason (R) : It…
- Directing nature of substituted aromatic compound is decided by stability of σ-complex or arenium ion. If σ-complex is…
- CH _ 3 - CH == CH _ 2 + NOCl P ; Identify the product. (2006)
- The reactivity of compound Z with different halogens under appropriate conditions is given below : The observed pattern…
- Which of the following statements is correct ? (I) Melting point of alkane increases with increase of C atoms and with…
- Aromatic compounds can easily show electrophilic substitution reactions due to the presence of pie electron clouds…
- Which of the following will produce a visible change with 1-butyne and can be used to differentiate it from 2-butyne ?
- The boiling point of trans-dichloroethene is 48 degress Celsius. Which number best approximates the boiling point of…
- Which of the following would not form upon electrolysis of aqueous solution of potassium propanoate ?
- The best method to prepare cyclohexene from cyclohexanol is by using
- Ethyl alcohol is heated with conc. H 2 SO 4 . The product formed is
- Assertion (A) : Alkenes usually undergo electrophilic addition reaction at carbon-carbon double bond. Reason (R) …
- The reagent(s) for the following conversion, is/are (2007)
- What is the major product in the reaction ?
- Nitration of benzene is possible by which of the following reagents ?
- The sulphonic acid group is often readily replaced by a nitro group e.g., This is because
- Directing nature of substituted aromatic compound is decided by stability of σ-complex or arenium ion. If σ-complex is…
- Which of the following cannot be used to prepare cumene from benzene ?
- Assertion (A) : Dimethyl sulphide is commonly used for the reduction of an alkene to get the carbonyl compound. Reason…
- The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The…
- Assertion (A) : Addition of HCl to 3-methyl-1-butene gives 2-chloro-2-methyl butane as the major product. Reason (R) …
- Compound(s) that on hydrogenation produce(s) optically inactive compound(s) is(are)
- In the presence of peroxide, hydrogen chloride and hydrogen iodide do not give anti-Markownikoff’s addition to alkenes…
- The product of acid catalysed hydration of 2-phenylpropene is
- Assertion (A) : Among isomeric alkanes, branching increase the boiling points. Reason (R) : Branching lowers the…
- Halogens are deactivating yet ortho, para directing in electrophilic aromatic substitution. Which statements do not…
- Which of the following is the correct structure of the organic product of the above reaction ?
- Choose the correct option(s) for the following set of reactions.
- Assertion (A) : A mixture of alkene and alkane can be separated by passing the mixture through a cold, concentrated…
- The bond dissociation energy of the C—H bond for the compound (Q) H _ 2 C = CH - CH _ 2 - H array l (S) array decreases…
- Aromatic compounds can easily show electrophilic substitution reactions due to the presence of pie electron clouds…
- The reagent(s) for the following conversion, , is/are
- An acyclic hydrocarbon P, having molecular formula C 6 H 10 , gave acetone as the only organic product through the…
- 1-chlorobutane on reaction with alcoholic potash gives
- 1-bromo-3-chlorocyclobutane when treated with two equivalents of Na, in the presence of ether which of the following…
- Aromatic compounds can easily show electrophilic substitution reactions due to the presence of pie electron clouds…
- Consider the following reaction Identify the structure of the major product X (2002)
- [ or light ] 3 Cl _ 2 Br _ 2 , Fe [ HCl ] Zn Product The main product is
- A benzene ring deactivated by strong and moderate electron withdrawing group that is, any meta directing group, is not…
- An electrophile, E ^ attacks the benzene ring to generate the intermediate σ–complex. of the following, which σ–complex…
- Schemes 1 and 2 describe sequential transformation of alkynes M and N. Consider only the major products formed in each…
- Cyclohexene is best prepared from cyclohexanol by which of the following? (2005)
- Which of the following are deactivating but ortho, para directing during electrophilic aromatic substitution reaction ?