Hydrocarbons practice · Medium

An organic compound ${\mathrm{C}_5}{\mathrm{H}_{11}}X$ on dehydrohalogenation gives pentene-2 only. What is halide?

Which fraction of coal-tar is rich in arene?

C – H bond energy is about101 kcal/mol for methane, ethane and other alkanes but is only77 kcal/mol for C – H bond of $\mathrm{C}{\mathrm{H}_3}$ in toluene. This is because

The molecule benzene can undergo a chemical reaction known as nitration.The carry out this
reaction there is need for the presence of two concentrated acids. Nitric acid is one, but
what is the other?

Assertion :-Ethyne and its derivatives give white precipate with ammonical silver nitrate solution.

Reason :- Alkynes gives white ppt with ammonical silver nitrate solution due to nucleophilic substitution reaction.

Select the incorrect statement regarding A
$C{H_3} - C \equiv CH + {H_2}OA$

All alkyl halides undergo reduction process except

Number of conformations possible in cyclohexane will be

The alkane with highest boiling point is

Addition of $\mathrm{B}{\mathrm{r}_2}$ on $cis -{\kern 1pt} {\kern 1pt} \mathrm{butene} - 2$ gives :

Select the organic compounds aliphatic in nature but burn with smoky flame :

The compound that will react most readily with gaseous bromine has the formula:

Acetylenic hydrogens are acidic because

Compound 'X' on treatment with $\mathrm{O}_3$ followed by $\mathrm{Zn} / \mathrm{H}_2 \mathrm{O}$ gives methanal and cyclohexyl methanal. The compound 'X' is:

The olefin which on ozonolysis gives $\mathrm{C}{\mathrm{H}_3}\mathrm{C}{\mathrm{H}_2}\mathrm{CHO}\;and\;\mathrm{C}{\mathrm{H}_3}\mathrm{CHO}$ is:

Assertion :- In the following reaction ${\text{C}}{{\text{H}}_2}{\text{ = C}}{{\text{H}}_{\text{2}}} + {\text{NaN}}{{\text{H}}_{\text{2}}} \to {\text{C}}{{\text{H}}_{\text{2}}} = \mathop {\text{C}}\limits^ - {\text{H}}\mathop {{\text{Na}}}\limits^ + + {\text{N}}{{\text{H}}_{\text{3}}}$
reaction is always in forward direction
Reason :-Ethene is stronger acid than ammonia.

Butyne-2 contains:

Which of the following compounds will show cis-trans isomerism?

Which of the following statement is incorrect regarding nitration of aromatic compounds?

I. The rate of nitration of benzene decreases at 323-333 K.

II. The rate of nitration of toluene is greater than that of benzene.

III. The rate of nitration of chlorobenzene is greater than that of benzene.

IV. Nitration is an electrophilic substitution reaction. Choose the incorrect statement.

2-Hexyne can be converted into trans-2-hexene
by the action of:

The alkane that gives only one mono-chloro product on chlorination with $C{l_2}$ in presence of diffused sunlight is

Pure methane can be produced by

Statement I : The boiling point of alkanes increases steadily with increase in size of chain
Statement II : Greater the length of the chain, greater is the surface area and hence, larger the vander Waal's attractive forces

$\mathrm{CH} \equiv \mathrm{CH} \xrightarrow[\mathrm{Cu}_2 \mathrm{Cl}_2]{\mathrm{NH}_4 \mathrm{Cl}} \text{product}$

Product is:

The alkyne which gives pyruvic acid $\left( {\mathrm{C}{\mathrm{H}_3}\mathrm{COCOOH}} \right)$ on oxidation with alk. $\mathrm{KMn}{\mathrm{O}_4}$ is:

Assertion (A): In the electrophilic substitution of aryl halides, the incoming electrophile gets attached to the meta position.

Reason (R): Aryl halides are moderately deactivating.

(A): Ethene is more reactive than ethane
(R): $\mathrm{C}=\mathrm{C}$ bond energy in ethene is more than that in ethane

Propyne does not react with

$\mathrm{CH}_2=\mathrm{CH}_2+\mathrm{Br}_2 \stackrel{\mathrm{CCl}_4}{\longrightarrow}$ Product (A). Product A is:

Amount of $\mathrm{B}{\mathrm{r}_2}$ required to react with 5 g pentene to form monobromo derivative is: