Organic Chemistry PYQ — Page 4

Given below are two statements: Statement I: There are several conformers for n -butane. Out of those conformers,  is the least stable and most stable conformer is  Statement II: As the dihedral angle increases, torsional strain decreases from (X) to $(\mathrm{Y})$. In the light of the above statements, choose the correct answer from the options given below

In Carius method 0.2425 g of an organic compound gave 0.5253 g silver chloride. The percentage of chlorine in the organic compound is

The cyclic cations having the same number of hyperconjugation are :  Choose the correct answer from the options given below :

Consider the following reaction sequence  The percentage of nitrogen in product ' T ' formed is $\_\_\_\_$%. (Nearest integer) (Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{~N}: 14, \mathrm{O}: 16$)

An organic compound "$x$" where molar ratio of C, O and H are equal, on treatment with $50\%$ KOH under reflux followed by acidification produced "$y$". The most likely structure of "$y$" is: [Molar mass of '$x$' is $58$ g mol$^{-1}$]

Given below are two statements: Statement I: In $O_2 N$-$C_6 H_4$-$CH^{\oplus}$-$C_6 H_4$-$OCH_3$, the carbocation is stabilised by $+R$ effect of $-OCH_3$ group. Statement II: In $O_2 N$-$C_6 H_4$-$CH^{\ominus}$-$C_6 H_4$-$OCH_3$, the carbanion is stabilised by $-R$ effect of $-NO_2$ group. In the light of the above statements, choose the correct answer from the options given below:

Method used for separation of mixture of products (B and C) obtained in the following reaction is 

Consider the following reaction of benzene.  In compound (Q), the percentage of oxygen is $\_\_\_\_$ %. (Nearest integer)

$2.0$ g of a bromo hydrocarbon $(X)$ was subjected to Carius analysis, gave $3.36$ g of $AgBr$. The percentage of carbon in the compound $(X)$ is $26.7\%$. Total number of carbon atoms in the empirical formula for compound $(X)$ is _____. (Given molar mass in g mol$^{-1}$ H:$1$, C:$12$, Br:$80$, Ag:$108$)

Match List - I with List - II. $\begin{array}{l} \text{List - I} & \text{List - II} \\ \text{Reaction of Glucose with} & \text{Product formed} \\ \text{A. Hydroxylamine} & \text{I. Gluconic acid} \\ \text{B. } \mathrm{Br}_{2} \text{ water} & \text{II. Glucose pentacetate} \\ \text{C. Excess acetic anhydride} & \text{III. Saccharic acid} \\ \text{D. Concentrated } \mathrm{HNO}_{3} & \text{IV. Glucoxime} \end{array}$ Choose the correct answer from the options given below :

 Consider the above sequence of reactions. The number of bromine atom(s) in the final product (P) will be :

Given below are four compounds : (a) n-propyl chloride (b) iso-propyl chloride (c) sec-butyl chloride (d) neo-pentyl chloride Percentage of carbon in the one which exhibits optical isomerism is :

The IUPAC name of the following compound is : 

Given below are two statements: Statement I:  can be synthesized from  using simpler reagents in the order i) Acidic $\mathrm{KMnO}_{4}$, ii) Ammonia, iii) Bromine and alkali Statement II:  can be converted into  using reagents in the order i) Bromine- $\mathrm{H}_{2} \mathrm{O}$ ii) $\mathrm{NaNO}_{2} / \mathrm{HCl}\left(0-5^{\circ} \mathrm{C}\right)$ (iii) Aq. $\mathrm{H}_{3} \mathrm{PO}_{2}$. In the light of the above statements, choose the correct answer from the options given below

 Identify (P)

Given below are two statements: Statement I: Methane can be prepared by decarboxylation of sodium ethanoate, Kolbe's electrolysis of sodium acetate and reaction of $\text{CH}_3\text{MgBr}$ with water. Statement II: Methane cannot be prepared from unsaturated hydrocarbons and by Wurtz reaction. In the light of the above statements, choose the correct answer from the options given below

An alkane $(Y)$ requires $8$ moles of oxygen for complete combustion and on chlorination with Cl$_2$/h$\nu$, $(Y)$ gives only one monochlorinated product $(Z)$. The total number of primary carbon atoms in $(Y)$ is __________.

Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I Deficiency Disease</th><th>List-II Vitamin</th></tr><tr><td>A. Scurvy</td><td>I. Pyridoxine</td></tr><tr><td>B. Convulsions</td><td>II. Vitamin A</td></tr><tr><td>C. Cheilosis</td><td>III. Ascorbic Acid</td></tr><tr><td>D. Xerophthalmia</td><td>IV. Riboflavin</td></tr></tbody></table> Choose the correct answer from the options given below:

In Dumas method for estimation of nitrogen, 0.50 g of an organic compound gave 70 mL of nitrogen collected at 300 K and 715 mm pressure. The percentage of nitrogen in the organic compound is $\_\_\_\_$ \%. (Aqueous tension at 300 K is 15 mm).

'$x$' is the product which is obtained by the hydrolysis of prop-1-yne in the presence of mercuric sulphate under dilute acidic medium at $333$ K. '$y$' is the product which is obtained by the reaction of ethane nitrile with methyl magnesium bromide in dry ether followed by hydrolysis. IUPAC name of product obtained from '$x$' and '$y$' in the presence of barium hydroxide followed by heating is :

Total number of alkali insoluble solid sulphonamides obtained by reaction of given amines with Hinsberg's reagent is $\_\_\_\_$. Aniline, N-Methylaniline, Methanamine, N, N-Dimethylmethanamine, N-Methyl methanamine, Phenylmethanamine, N-propylaniline, N-phenylaniline, N, N-Dimethylaniline, Allyl amine, Isopropyl amine

Match List - I with List - II. $\begin{array}{l} \text{List - I} & \text{List - II} \\ \text{Functional group (detection)} & \text{Change observed during detection} \\ \text{A. Unsaturation (Baeyer's test)} & \text{I. Red colour appears} \\ \text{B. Alcoholic group} \\ \text{(Ceric ammonium nitrate test)} & \text{II. Silver mirror appears} \\ \text{C. Aldehyde group (Tollen's reagent)} & \text{III. Violet colour appears} \\ \text{D. Phenolic group } \left(\mathrm{FeCl}_{3}\right. \text{ test)} & \text{IV. Discharge of pink colour} \end{array}$ Choose the correct answer from the options given below :

Identify the correct statements : The presence of $-\mathrm{NO}_{2}$ group in benzene ring A. activates the ring towards electrophilic substitutions. B. deactivates the ring towards electrophilic substitutions. C. activates the ring towards nucleophilic substitutions. D. deactivates the ring towards nucleophilic substitutions. Choose the correct answer from the options given below :

Consider the following sequence of reactions.  Assuming that the reaction proceeds to completion, then 137 mg of 4 -nitrotoluene will produce $\_\_\_\_$ mg of $B$. (Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{~N}: 14, \mathrm{O}: 16, \mathrm{Br}: 80$)