Hydrocarbons

In the reaction \ce{HC#CH ->[\text{(1) }NaNH2/\text{liq }NH3][\text{(2) }CH3CH2Br] X ->[\text{(1) }NaNH2/\text{liq }NH3][\text{(2) }CH3CH2Br] Y}, X and Y are:

The correct statement regarding the comparison of staggered and eclipsed conformations of ethane, is:

The pair of electrons in the given carbanion, \ce{CH3-C#C^-}, is present in which of the following orbitals?

In which of the following molecules are all atoms coplanar?

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

With respect to the conformers of ethane, which of the following statements is true?

Predict the correct intermediate (A) and product (B) in the following reaction: \ce{H3C-C#CH ->[\text{H2O, H2SO4}][\text{HgSO4}] (A) -> (B)}

Which one is the correct order of acidity?

The compound \ce{C7H8} (toluene) undergoes the following reactions: \ce{C7H8 ->[3Cl2,\ \Delta] A ->[Br2/Fe] B ->[Zn/HCl] C} The product 'C' is

Hydrocarbon (A) reacts with bromine by substitution to form an alkyl bromide which, by Wurtz reaction, is converted to a gaseous hydrocarbon containing less than four carbon atoms. (A) is

Which of the following molecules represents the order of hybridisation $sp^2, sp^2, sp, sp$ from left to right atoms?

The number of sigma ($\sigma$) and pi ($\pi$) bonds in pent-2-en-4-yne is

The most suitable reagent for the following conversion is: \ce{CH3-C#C-CH3 -> } cis-2-butene

Among the following, the reaction that proceeds through an electrophilic substitution is:

An alkene "A" on reaction with \ce{O3} and \ce{Zn-H2O} gives propanone and ethanal in equimolar ratio. Addition of \ce{HCl} to alkene "A" gives "B" as the major product. The structure of product "B" is:

The most stable carbocation among the following is:

The alkane that gives only one mono-chloro product on chlorination with \ce{Cl2} in presence of diffused sunlight is:

In the following reaction, \ce{H3C-C#CH} is passed through a red hot iron tube at $873\,\text{K}$ to give product $A$. The number of sigma ($\sigma$) bonds present in the product $A$ is:

Which of the following alkane cannot be made in good yield by Wurtz reaction?

An alkene on ozonolysis gives methanal (\ce{HCHO}) as one of the products. Its structure is:

Which of the following is the correct structure of 2,6-dimethyldec-4-ene?

The dihedral angle of the least stable conformer of ethane is:

The major product of the following reaction is: \ce{(CH3)2CH-CH=CH2 ->[HBr][(C6H5CO)2O2] ?}

Identify the missing reagent/chemical in the reaction: \ce{CH3CH2COONa ->[NaOH,\ ?][\Delta] CH3CH3 + Na2CO3}

Which compound amongst the following is not an aromatic compound?

Compound X on reaction with \ce{O3} followed by \ce{Zn/H2O} gives formaldehyde and 2-methylpropanal as products. The compound X is:

The correct IUPAC name of the following compound is:

Consider the following compounds/species: (i) naphthalene; (ii) cyclopentadienyl anion; (iii) cyclobutadiene; (iv) cyclopropenyl anion; (v) cyclopropenyl cation; (vi) cyclooctatetraene; (vii) anthracene. The number of compounds/species which obey Hückel's rule is ______.

Which amongst the following compounds will show geometrical isomerism?

A compound with a molecular formula of \ce{C6H14} has two tertiary carbons. Its IUPAC name is:

Given below are two statements: Statement I: The boiling point of three isomeric pentanes follows the order n-pentane > isopentane > neopentane. Statement II: When branching increases, the molecule attains a shape of sphere. This results in smaller surface area for contact, due to which the intermolecular forces between the spherical molecules are weak, thereby lowering the boiling point. In the light of the above statements, choose the most appropriate answer from the options given below:

Match List-I with List-II. List-I (Reaction): A. Cyclohexene (cyclic alkene) $\rightarrow$ open-chain dicarbonyl compound B. Benzene $\rightarrow$ benzophenone (diphenyl ketone, \ce{C6H5-CO-C6H5}) C. Cyclohexanol (\ce{-OH}) $\rightarrow$ cyclohexanone (\ce{C=O}) D. Ethylbenzene (\ce{C6H5-CH2CH3}) $\rightarrow$ benzoic acid (\ce{C6H5-COOH}) List-II (Reagents/Condition): I. Anhyd. \ce{AlCl3} II. \ce{CrO3} III. \ce{KMnO4/KOH},\ $\Delta$ IV. (i) \ce{O3}, (ii) \ce{Zn-H2O} Choose the correct answer from the options given below:

For the given reaction, 'P' is: \ce{C6H5-CH=CH-C6H5 ->[KMnO4/H+] P} (major product) (stilbene undergoes oxidation with hot acidic potassium permanganate)

Which one of the following reactions does NOT give benzene as the product?

How many products (including stereoisomers) are expected from monochlorination of 2-methylbutane, \ce{(CH3)2CH-CH2-CH3}?

Among the compounds I, II and III shown, the correct order of bond dissociation energy of the C–H bond marked with $*$ is: (I) benzene, aryl (sp$^2$) C–H; (II) phenylacetylene \ce{C6H5-C#C-H}, terminal alkynyl (sp) C–H; (III) 3-methylenecyclopropane / cyclopropene bearing an exocyclic \ce{CH2}, the methylene (sp$^3$) C–H.

Which one of the following compounds does NOT decolourize bromine water?

Which one of the following compounds can exist as cis-trans isomers?

Among the following, the compound having conjugated double bonds is:

Consider the reaction sequences and choose the correct option. $Ph\text{-}C\equiv C\text{-}Me$ with $\ce{Na}$/liq. $\ce{NH3}\to L$; with $\ce{H2}$, Pd/C (Lindlar's catalyst) $\to K$. Then $L\xrightarrow{\text{HBr, benzoyl peroxide}}N$ and $K\xrightarrow{\text{HBr}}M$.

Statement-I: trans-But-2-ene on treatment with $\ce{Br2}$ in $\ce{CCl4}$ gives the shown product (a meso-2,3-dibromobutane). Statement-II: cis-But-2-ene on treatment with alkaline $\ce{KMnO4}$ gives the shown product (meso-butane-2,3-diol). Choose the most appropriate answer:

The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively, are: \ce{C6H6 + 6Cl2 ->[\text{anhyd. }AlCl3][\text{dark, cold}] X} and \ce{C6H6 + 3Cl2 ->[\text{UV}][500\,K] Y}