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NEET • CHEMISTRY • HYDROCARBONS

Hydrocarbons practice · Easy

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Showing 1-30 of 90 questions

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1 Easy
1 of 90
Remembering +4 | -1
The reaction of alkanes with halogen is explosive in the case of:
View answer and explanation
Correct option: A
F2{\mathrm{F}_2}
Option A (F2{\mathrm{F}_2}) is correct because the reaction of alkanes with fluorine is highly exothermic and explosive.
2 Easy
2 of 90
Understanding +4 | -1
A mixture of sodium benzoate and soda lime on heating produces
View answer and explanation
Correct option: B
C6H6{C_6}{H_6}
Option B (C6H6{C_6}{H_6}) is correct because sodium benzoate and soda lime on heating undergo decarboxylation to form benzene.
3 Easy
3 of 90
Understanding +4 | -1
The reactivity of halogens towards any given alkane is in order of
View answer and explanation
Correct option: B
F2>Cl2>Br2>I2{F_2} > C{l_2} > B{r_2} > {I_2}
Option B (F2>Cl2>Br2>I2{F_2} > C{l_2} > B{r_2} > {I_2}) is correct because the reactivity of halogens towards alkanes decreases down the group due to decreasing bond dissociation energy.
4 Easy
4 of 90
Application +4 | -1
The treatment of benzene with benzoyl chloride in the presence of AlCl3\mathrm{AlC}{\mathrm{l}_3} gives
View answer and explanation
Correct option: B
Benzophenone
Benzophenone is the correct answer because the reaction of benzene with benzoyl chloride in the presence of AlCl3\mathrm{AlC}{\mathrm{l}_3} is a Friedel-Crafts acylation, which adds a benzoyl group to benzene.
5 Easy
5 of 90
Application +4 | -1
Electrolysis of cold concentrated aqueous solution of potassium succinate yields
View answer and explanation
Correct option: C
ethene
Option C (ethene) is correct because the electrolysis of potassium succinate leads to the formation of ethene via the Kolbe electrolysis mechanism.
6 Easy
6 of 90
Application +4 | -1
Isopropyl bromide on Wurtz reaction gives
View answer and explanation
Correct option: C
2,3-dimethyl butane
Option C (2,3-dimethyl butane) is correct because the Wurtz reaction involves coupling two alkyl halides, and in this case, two isopropyl groups combine to form 2,3-dimethylbutane.
7 Easy
7 of 90
Understanding +4 | -1
Anti-addition of hydrogen atoms to the triple bond takes place by
View answer and explanation
Correct option: B
Li/NH3Li/N{H_3}
Option B (Li/NH3Li/N{H_3}) is correct because the reduction of alkynes with lithium in liquid ammonia results in trans-addition of hydrogen atoms.
8 Easy
8 of 90
Analyzing +4 | -1
Which of the following compounds contain 10,20,30{1^0},{2^0},{3^0} as well as 40{4^0} carbon atoms
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Correct option: D
2,2,3-trimethyl pentane
Option D (2,2,3-trimethyl pentane) is correct because it contains primary, secondary, tertiary, and quaternary carbon atoms.
9 Easy
9 of 90
Analyzing +4 | -1
An alkene on vigorous oxidation with KMnO4\mathrm{KMn}{\mathrm{O}_4} gives only acetic acid. The alkene is
View answer and explanation
Correct option: B
CH3CH=CHCH3\mathrm{C}{\mathrm{H}_3}\mathrm{CH} = \mathrm{CHC}{\mathrm{H}_3}
Option B (CH3CH=CHCH3\mathrm{C}{\mathrm{H}_3}\mathrm{CH} = \mathrm{CHC}{\mathrm{H}_3}) is correct because vigorous oxidation with KMnO4\mathrm{KMn}{\mathrm{O}_4} yields only acetic acid.
10 Easy
10 of 90
Understanding +4 | -1
Which one of the following is not an oxidation product of alkane
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Correct option: D
ether
Option D (ether) is correct because ethers are not direct oxidation products of alkanes. Oxidation of alkanes typically yields alcohols, aldehydes, and carboxylic acids.
11 Easy
11 of 90
Application +4 | -1
Major product of the following reaction is
CH3CH2CCl∣HCH3→ΔAlC.KOHC{H_3}C{H_2}\mathop C\limits_{\mathop {Cl}\limits^| } HC{H_3}\xrightarrow[\Delta ]{{AlC.KOH}}
View answer and explanation
Correct option: B
but-2-ene
Option B (but-2-ene) is correct because the major product of the dehydrohalogenation reaction is the more substituted alkene (Zaitsev's rule).
12 Easy
12 of 90
Understanding +4 | -1
The addition reaction opposite to the Markownikoff’s rule is not observed in
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Correct option: B
but – 2 - ene
Option B (but – 2 - ene) is correct because but-2-ene is a symmetrical alkene, and the addition reaction follows Markownikoff's rule regardless of the presence of peroxides.
13 Easy
13 of 90
Remembering +4 | -1
A reagent used to test for unsaturation of alkene is
View answer and explanation
Correct option: D
Solution of Br2B{r_2} in CCl4CC{l_4}
Option D is correct because a solution of bromine in carbon tetrachloride (Br2\mathrm{Br_2} in CCl4\mathrm{CCl_4}) is a common reagent used to test for unsaturation in alkenes. The bromine adds across the double bond, causing the reddish-brown color of the bromine solution to disappear.
14 Easy
14 of 90
Application +4 | -1
Complete oxidation of one mole of an alkane forms 3 moles of CO2\mathrm{C}{\mathrm{O}_2}. The alkane is
View answer and explanation
Correct option: C
C3H8{\mathrm{C}_3}{\mathrm{H}_8}
Option C (C3H8{\mathrm{C}_3}{\mathrm{H}_8}) is correct because the complete combustion of propane produces 3 moles of CO2, matching the problem statement.
15 Easy
15 of 90
Understanding +4 | -1
As branching in alkane increases, boiling point decreases due to
View answer and explanation
Correct option: A
decreased surface area for intermolecular attraction
Option A (decreased surface area for intermolecular attraction) is correct because branching in alkanes reduces the surface area available for van der Waals interactions, leading to lower boiling points.

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16 Easy
16 of 90
Analyzing +4 | -1
Which one of the following gives only one monochloro derivative?
View answer and explanation
Correct option: D
neo-pentane
Option D (neo-pentane) is correct because all hydrogen atoms in neo-pentane are equivalent, leading to only one possible monochloro derivative.
17 Easy
17 of 90
Remembering +4 | -1
Acetylene is not used in making:
View answer and explanation
Correct option: C
Glucose
Option C (Glucose) is correct because acetylene is not directly used in the production of glucose.
18 Easy
18 of 90
Remembering +4 | -1
Benzene is obtained from which of the following oils after fractional distillation of coal-tar
View answer and explanation
Correct option: A
Light oil
Option A (Light oil) is correct because benzene is primarily obtained from the light oil fraction during the fractional distillation of coal tar.
19 Easy
19 of 90
Analyzing +4 | -1
Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?
View answer and explanation
Correct option: A
NaNH2\mathrm{NaN}{\mathrm{H}_2}
The correct answer is NaNH2\mathrm{NaN}{\mathrm{H}_2} because it can deprotonate 1-butyne but not 2-butyne.
20 Easy
20 of 90
Understanding +4 | -1
When η−Hexane\eta - Hexane is treated with anhydrous AlCl3AlC{l_3} and HClHCl gas, the product obtained is
View answer and explanation
Correct option: D
A mixture of 2 – methyl pentane & 3 – methyl pentane
Option D (A mixture of 2 – methyl pentane & 3 – methyl pentane) is correct because isomerization of n-hexane in the presence of anhydrous AlCl3AlCl_3 and HClHCl yields a mixture of branched isomers.
21 Easy
21 of 90
Understanding +4 | -1
When ethyl chloride and alcoholic KOH\mathrm{KOH} are heated, the compound obtained is
View answer and explanation
Correct option: A
C2H4{\mathrm{C}_2}{\mathrm{H}_4}
Option A (C2H4{\mathrm{C}_2}{\mathrm{H}_4}) is correct because the reaction of ethyl chloride with alcoholic KOH leads to dehydrohalogenation, resulting in the formation of ethene.
22 Easy
22 of 90
Understanding +4 | -1
Which salt can be converted into alkyne by Kolbe’s method.
View answer and explanation
Correct option: C
sodium fumarate
Option C (sodium fumarate) is correct because Kolbe's electrolysis of sodium fumarate yields an alkyne (acetylene).
23 Easy
23 of 90
Analyzing +4 | -1
Correct statement about 1,3-dibutene
View answer and explanation
Correct option: D
All of the above
Option D (All of the above) is correct because 1,3-dibutene has conjugated double bonds, reacts with HBr, and can form a polymer.
24 Easy
24 of 90
Application +4 | -1
Hydration of but-2-ene gives
View answer and explanation
Correct option: A
CH3CH2C∣OHHCH3C{H_3}C{H_2}\mathop C\limits_{\mathop |\limits_{OH} } HC{H_3}
Option A (CH3CH2C∣OHHCH3C{H_3}C{H_2}\mathop C\limits_{\mathop |\limits_{OH} } HC{H_3}) is correct because hydration of but-2-ene in the presence of an acid catalyst follows Markovnikov's rule, leading to the formation of butan-2-ol.
25 Easy
25 of 90
Remembering +4 | -1
The number of carbon atoms in hydrocarbons of kerosene is in the range of:
View answer and explanation
Correct option: B
C12−C16{\mathrm{C}_{12}}-{\mathrm{C}_{16}}
Option B (C12−C16{\mathrm{C}_{12}}-{\mathrm{C}_{16}}) is correct because kerosene typically contains hydrocarbons with carbon chain lengths ranging from C12 to C16.
26 Easy
26 of 90
Analyzing +4 | -1
Assertion (A) Friedel-Crafts reaction benzene with n-propyl chloride onheating produce isopropyl benzene

Reason (R) Benzene undergoes electrophilic substitution easily.
View answer and explanation
Correct option: B
If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
Option B (If both Assertion and Reason are true but Reason is not the correct explanation of Assertion) is correct because while both statements are true, the ease of electrophilic substitution doesn't directly explain why n-propyl chloride rearranges to isopropyl chloride.
27 Easy
27 of 90
Remembering +4 | -1
Position of double bond in alkenes is identified by
View answer and explanation
Correct option: A
Ozonolysis
Option A (Ozonolysis) is correct because ozonolysis cleaves the double bond and the products formed can be used to determine the position of the double bond.
28 Easy
28 of 90
Understanding +4 | -1
CaC2+H2O→A→H2SO4HgSO4B,Ca{C_2} + {H_2}O \to A\xrightarrow[{{H_2}S{O_4}}]{{HgS{O_4}}}B, Identify AA and BB
View answer and explanation
Correct option: A
C2H2  and  CH3CHO{C_2}{H_2}\,\,and\,\,C{H_3}CHO
Option A (C2H2  and  CH3CHO{C_2}{H_2}\,\,and\,\,C{H_3}CHO) is correct because calcium carbide reacts with water to form ethyne, which then undergoes hydration to form ethanal.
29 Easy
29 of 90
Remembering +4 | -1
The treatment of calcium carbides with water gives
View answer and explanation
Correct option: B
acetylene
Option B (acetylene) is correct because calcium carbide (CaC2CaC_2) reacts with water to produce acetylene (C2H2C_2H_2).
30 Easy
30 of 90
Understanding +4 | -1
Hydration of ethyne to ethanol takes place through the formation of
View answer and explanation
Correct option: B
CH2=CHOHC{H_2} = CHOH
Option B (CH2=CHOHC{H_2} = CHOH) is correct because the hydration of ethyne initially forms vinyl alcohol (CH2=CHOHC{H_2} = CHOH), which then tautomerizes to acetaldehyde.
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