Hydrocarbons MCQs

Compounds consisting of hydrogen and carbon are called hydrocarbons. These compounds can be straight-chain, branched, or cyclic. Hydrocarbons are naturally found in coal, natural gas, and many polymers like polystyrene and polyethylene. A hydrocarbon with all single C-C bonds is known as a saturated hydrocarbon (alkane), while those with double or triple C-C bonds are called unsaturated hydrocarbons (alkenes and alkynes, respectively). Various functional groups (such as halide, hydroxyl, aldehyde, and carboxylic groups) can also be attached to the carbon atoms in hydrocarbons.

2. Identify Z in the given reaction:

Which one of the following compounds forms salt on reaction with NaNH2?

(a) C₂H₂
(b) C₂H₆
(c) C₆H₆
(d) C₂H₄

A compound having a bond angle of 180° is

(a) alkyne
(b) alkane
(c) alkene
(d) cycloalkane

The product obtained on heating 2-Bromopentane with potassium ethoxide in ethanol is

(a) 1-pentene
(b) 2-cis-pentene
(c) trans-2-pentene
(d) 2-ethoxy pentane

C₆H₅CHO is formed when C₆H₆ is treated with CO and HCl in the presence of anhydrous AlCl₃. Name of the reaction is:

(a) Friedel-Crafts reaction
(b) Gattermann-Koch reaction
(c) Rosenmund reaction
(d) Stephen reaction

Which one of the following halides can be used in the Friedel-Crafts reaction?

(a) Isopropyl chloride
(b) Bromobenzene
(c) Chlorobenzene
(d) Chloroethene

Isopropyl iodide is formed after reaction of propene with HI, this is due to

(a) more stable free radical
(b) homolysis
(c) more stable carbanion
(d) more stable carbocation

Choose the process by which liquid hydrocarbons can be converted to gaseous hydrocarbons

(a) hydrolysis
(b) oxidation
(c) cracking
(d) distillation under reduced pressure

Which among the following reagents can be used to distinguish between CH₂BrCH=CH₂ from CH₃CH=CHBr?

(a) Br₂/CCl₄
(b) cold KMnO₄
(c) AgNO₃/C₂H₅OH
(d) Ag(NH₃)₂OH

Find the correct order of increasing acidity