Organic Chemistry PYQ — Page 7

Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I Amino acid</th><th>List-II Positive reaction/Test for functional group present in side chain of amino acid</th></tr><tr><td>A. Glutamine</td><td>I. Hinsberg's test</td></tr><tr><td>B. Lysine</td><td>II. Neutral $\text{FeCl}_3$ test</td></tr><tr><td>C. Tyrosine</td><td>III. Ceric ammonium nitrate test</td></tr><tr><td>D. Serine</td><td>IV. Hoffman bromamide degradation</td></tr></tbody></table> Choose the correct answer from the options given below:

A D-aldotetrose on oxidation with concentrated $HNO_3$ resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

The unsaturated ether on acidic hydrolysis produces carbonyl compounds as shown below:- $\begin{aligned} \mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}- & \mathrm{O}-\mathrm{CH}=\mathrm{CH}_{2} \\ & \downarrow \mathrm{H}_{3} \mathrm{O}^{(+)} \\ \mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}= & \mathrm{O} \text { and } \mathrm{O}=\mathrm{CH}-\mathrm{CH}_{3} \end{aligned}$ Based on this, predict the solution/reagent that will help to distinguish " P " and " Q " obtained in the following reaction:- 

Identify the correct pair having amino acid (A) and the hormone (B) that is iodinated derivative of the amino acid (A). (T and Y represent one letter code for amino acids) <table class="pyq-table"><tbody><tr><th>Amino acid (A)</th><th>Hormone (B)</th></tr></tbody></table>

The number of possible tripeptides formed involving alanine (ala), glycine (gly) and valine (val), where no amino acid has been used more than once is:

Given below are two statements: Statement I: Sucrose is dextrorotatory. However, sucrose upon hydrolysis gives a solution having mixture of products. This solution shows laevorotation. Statement II: Hydrolysis of sucrose gives glucose and fructose. Since the laevorotation of glucose is more than the dextrorotation of fructose, the resulting solution becomes laevorotatory. In the light of the above statements, choose the correct answer from the options given below

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

Identify the correct statements. A. Arginine and Tryptophan are essential amino acids. B. Histidine does not contain heterocyclic ring in its structure. C. Proline is a six membered cyclic ring amino acid. D. Glycine does not have chiral centre. E. Cysteine has characteristic feature of side chain as $\mathrm{MeS}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-$. Choose the correct answer from the options given below :

Consider compounds A, B and C with following structural formulae $A = $ CH$_3$ - CH$_2$ - CH$_2$ - CH$_2$ - CH$_2$ - OH $B = $ CH$_2 =$ CH - CH$_2$ - CH$_2$ - CH$_3$ $C = $ HO - CH$_2$ - CH$_2$ - CH(OH) - CH$_3$ For the conversion of B from A, reagent (D) required is _________ and structural formula of product (E) obtained when C undergoes same reaction using excess reagent (D) is _________.

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:

An organic compound $(\mathrm{P})$ on treatment with aqueous ammonia under hot condition forms compound (Q) which on heating with $\mathrm{Br}_{2}$ and KOH forms compound (R) having molecular formula $\mathrm{C}_{6} \mathrm{H}_{7} \mathrm{~N}$. Names of P, Q and R respectively are.

Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I Name of amino acid</th><th>List-II One letter symbol/type</th></tr><tr><td>A. Arginine</td><td>I. D/Non-essential</td></tr><tr><td>B. Aspartic acid</td><td>II. R/Essential</td></tr><tr><td>C. Lysine</td><td>III. E/Non-essential</td></tr><tr><td>D. Glutamic acid</td><td>IV. K/Essential</td></tr></tbody></table> Choose the correct answer from the options given below:

0.25 g of an organic compound " A " containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of $\mathrm{CaCl}_{2}$ tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g, respectively. The percentage of oxygen in compound A is %. (Nearest integer) (Given: molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{O}: 16$)

Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I Name of reaction</th><th>List-II Reagent or catalyst used</th></tr><tr><td>A. Finkelstein reaction</td><td>I. $SbF_3$</td></tr><tr><td>B. Swarts reaction</td><td>II. $Na$, dry ether</td></tr><tr><td>C. Sandmeyer's reaction</td><td>III. $NaI$</td></tr><tr><td>D. Fittig reaction</td><td>IV. $Cu_2Cl_2$</td></tr></tbody></table> 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

Consider the following molecules/species:  $(x)$ tropone, $(y)$ acetone, $(z)$ acetate ion The correct order of carbon – oxygen double bond length is:

But-2-yne and hydrogen (one mole each) are separately treated with (i) $\mathrm{Pd} / \mathrm{C}$ and (ii) $\mathrm{Na} / \mathrm{liq}. \mathrm{NH}_{3}$ to give the products X and Y respectively.  Identify the incorrect statements. A. $X$ and $Y$ are stereoisomers. B. Dipole moment of X is zero. C. Boiling point of $X$ is higher than $Y$. D. X and Y react with $\mathrm{O}_{3} / \mathrm{Zn}+\mathrm{H}_{2} \mathrm{O}$ to give different products. Choose the correct answer from the options given below :

Complete combustion of $X$ g of an organic compound gave $0.25$ g of $CO_2$ and $0.12$ g of $H_2 O$. If the % of carbon is $25\%$ and of hydrogen is $4.89\%$, then $X = $ _____ $\times 10^{-3}$ g. (Nearest integer) (Molar mass of C, H and O are $12, 1$ and $16$ g mol$^{-1}$ respectively.)

Which of the following statements are TRUE about Haloform reaction?: A. Sodium hypochlorite reacts with KI to give KOI. B. KOI is a reducing agent. C. $\alpha, \beta$-unsaturated methylketone $\left(\mathrm{CH}_{3}-\mathrm{CH}=\mathrm{CH}-\stackrel{\mathrm{O}}{\mathrm{O}}-\mathrm{CH}_{3}\right)$ will give iodoform reaction. D. Isopropyl alcohol will not give iodoform test. E. Methanoic acid will give positive iodoform test. Choose the correct answer from the options given below:

Sodium fusion extract of an organic compound $(\mathrm{Y})$ with $\mathrm{CHCl}_{3}$ and chlorine water gives violet color to the $\mathrm{CHCl}_{3}$ layer. 0.15 g of $(\mathrm{Y})$ gave 0.12 g of the silver halide precipitate in Carius method. Percentage of halogen in the compound $(\mathrm{Y})$ is $\_\_\_\_$. (Nearest integer) (Given : molar mass $\mathrm{g} \mathrm{mol}^{-1} \mathrm{C}: 12, \mathrm{H}: 1, \mathrm{Cl}: 35.5, \mathrm{Br}: 80, \mathrm{I}: 127$)

Which of the following reaction is NOT correctly represented?

Which of the following amino acid will give violet coloured complex with neutral ferric chloride solution?

Given below are two statements: Statement I: The structure of Maltose is given below:  Maltose is a non-reducing sugar. Statement II: The structure of Lactose is given below:  Lactose is a reducing sugar. In the light of the above statements, choose the correct answer from the options given below

Grignard reagent $\mathrm{RMgBr}(\mathrm{P})$ reacts with water and forms a gas (Q). One gram of Q occupies $1.4 \mathrm{dm}^{3}$ at STP. (P) on reaction with dry ice in dry ether followed by $\mathrm{H}_{3} \mathrm{O}^{+}$forms a compound (Z). 0.1 mole of (Z) will weigh $\_\_\_\_$ g. (Nearest integer)