Organic Chemistry PYQ — Page 5

Given below are two statements : Statement I: Sublimation is used for the separation and purification of compounds with low melting point. Statement II: The boiling point of a liquid increases as the external pressure is reduced. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements: Statement I: Phenol on treatment with $\mathrm{CHCl}_{3}$ /aq. KOH under refluxing condition, followed by acidification produces $p$-hydroxy benzaldehyde as the major product and $o$-hydroxy benzaldehyde as the minor product. Statement II: The mixture of $p$-hydroxybenzaldehyde and $o$ hydroxybenzaldehyde can be easily separated through steam distillation. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements: Statement I: On the basis of inductive effect, the order of stability of alkyl carbanions is CH$_3^- >$ CH$_3$-CH$_2^- >$ (CH$_3$)$_2$CH$^- >$ (CH$_3$)$_3$C$^-$. Statement II: Allyl and benzyl carbanions are more stabilised by inductive effect and not by resonance effect. In the light of the above statements, choose the correct answer from the options given below

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

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

Given below are two statements: Statement I: $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$ is more stable than $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$ as nine hyperconjugation interactions are possible in $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$. Statement II: $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$ is less stable than $\left(\mathrm{CH}_{3}\right)_{3} \stackrel{\oplus}{\mathrm{C}}$ as only three hyperconjugation interactions are possible in $\stackrel{\oplus}{\mathrm{C}} \mathrm{H}_{3}$. In the light of the above statements, choose the correct answer from the options given below

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:

Given below are two statements : Statement I: Heating benzamide with bromine in an ethanolic solution of sodium hydroxide will give benzylamine. Statement II: Nitration of aniline with $HNO_3/H_2SO_4$ at $288\text{ K}$ produces $m$-nitroaniline in higher amount than $o$-nitroaniline (pH adjusted). In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements: Statement I: Griss-Ilosvay test is used for the detection of nitrite ion, which involves the use of sulphanilic acid and $\alpha$-naphthylamine reagent. Statement II: In the above test, sulphanilic acid is diazotized by the acidified nitrite ion, which on further coupling with $\alpha$-naphthylamine forms an azo-dye. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements: Statement I: Due to increase in van der Waals forces, the order of boiling points is CH$_3$CH$_2$CH$_2$I > CH$_3$CH$_2$I > CH$_3$I. Statement II: As para-dichlorobenzene is more symmetric, its melting point is higher than ortho-dichlorobenzene, however its boiling point is lower than ortho-dichlorobenzene. In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: Statement I: Cross aldol condensation between two different aldehydes will always produce four different products. Statement II: When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements : Statement I: Compound $(X)$, shown below, dissolves in $\mathrm{NaHCO}_{3}$ solution and has two chiral carbon atoms  Statement II: Compound $(\mathrm{Y})$, shown below, has two carbons with $\mathrm{sp}^{3}$ hybridization, one carbon with $\mathrm{sp}^{2}$ and one carbon with sp hybridization  In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements: Statement I: ' $\mathrm{C}-\mathrm{Cl}^{\prime}$ bond is stronger in $\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{Cl}$ than $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{Cl}$ Statement II: The given optically active molecule,  on hydrolysis gives a solution that can rotate the plane polarized light. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements : Statement (I) : Benzyl chloride reacts faster in $S_N1$ mechanism than ethyl chloride. Statement (II) : Ethyl carbocation intermediate is less stabilized by hyperconjugation than benzyl carbocation by resonance. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements: Statement I: Benzene is nitrated to give nitrobenzene, which on further treatment with $\mathrm{CH}_{3} \mathrm{COCl} / \mathrm{AlCl}_{3}$ will give  Statement II: $-\mathrm{NO}_{2}$ group is a $m$-directing, and deactivating group. In the light of the above statements, choose the most appropriate answer from the options given below

Given below are two statements : Statement I : A mixture of C$_{12}$H$_{22}$O$_{11}$ (sugar) and NaCl can be separated by dissolving sugar in alcohol, due to differential solubility. Statement II : Rose essence from rose petals is seperated by steam distillation due to its high volatility and insolubility in H$_2$O. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements: Statement I: $3$-phenylpropene reacts with HBr and gives secondary alkyl bromide having a chiral carbon atom as the major product. Statement II: Aryl chlorides and aryl cyanides can be prepared by Sandmeyer reaction as well as Gattermann reaction. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements: Statement I: $2,6$-diethylcyclohexanone and $6$-methyl-$2$-n-propylcyclohexanone are metamers. Statement II: $2,2,6,6$-tetramethylcyclohexanone exhibits keto-enol tautomerism. In the light of the above statements, choose the correct answer from the options given below

Given below are two statements for the following reaction sequence.  Statement I: Compound ' $Z$ ' will give yellow precipitate with NaOI. Statement II: Compound ' Q ' has two different types of ' H ' atoms (aromatic : aliphatic) in the ratio 1:3. In the light of the above statements, choose the correct answer from the options given below:

Given below are the four isomeric compounds $(\mathrm{P}, \mathrm{Q}, \mathrm{R}, \mathrm{S})$  Identify correct statements from below. A. $\mathrm{Q}, \mathrm{R}$ and S will give precipitate with $2,4-\mathrm{DNP}$. B. P and Q will give positive Bayer's test. C. Q and R will give sooty flame. D. R and S will give yellow precipitate with $\mathrm{I}_{2} / \mathrm{NaOH}$. E. Q alone will deposit silver with Tollen's reagent Choose the correct option.

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 :

$4.7$ g of phenol is heated with Zn to give product X. If this reaction goes to $60\%$ completion then the number of moles of compound X formed will be _______ $\times 10^{-2}$. (Nearest Integer) (Given molar mass in g mol$^{-1}$: H:1, C:12, O:16)

$2.0$ 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:$108$)

From the given following (A to D) cyclic structures, those which will not react with Tollen's reagent are :