Organic Chemistry PYQ

$4.7$ 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)

The mass of benzanilide obtained from the benzoylation reaction of 5.8 g of aniline, if yield of product is $82 \%$, is $\_\_\_\_$ g (nearest integer). (Given molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{~N}: 14, \mathrm{O}: 16$)

Consider the following sequence of reactions.  The percentage of nitrogen in the yellow product (X) formed is _______%. (Nearest Integer) (Given Molar mass in g mol$^{-1}$ H:1, C:12, N:14)

Identify A in the following reaction. 

Match List - I with List - II. <table class="pyq-table"><tbody><tr><th>List - I Vitamin</th><th>List - II Name</th></tr><tr><td>A. Vitamin $B_1$</td><td>I. Pyridoxine</td></tr><tr><td>B. Vitamin $B_2$</td><td>II. Ascorbic acid</td></tr><tr><td>C. Vitamin $B_6$</td><td>III. Thiamine</td></tr><tr><td>D. Vitamin C</td><td>IV. Riboflavin</td></tr></tbody></table> Choose the correct answer from the options given below :

The descending order of acidity among the following compounds is: A. Phenol B. $4$-nitrophenol C. $4$-methoxyphenol D. $4$-nitrobenzoic acid E. Benzoic acid  Choose the correct answer from the options given below:

The cycloalkene $(\mathrm{X})$ on bromination consumes one mole of bromine per mole of $(\mathrm{X})$ and gives the product $(\mathrm{Y})$ in which $\mathrm{C}: \mathrm{Br}$ ratio is 3:1. The percentage of bromine in the product $(\mathrm{Y})$ is $\_\_\_\_$%. (Nearest integer) (Given : molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{H}: 1, \mathrm{C}: 12, \mathrm{O}: 16, \mathrm{Br}: 80$)

The dibromo compound $[\mathrm{P}]$ (molecular formula : $\mathrm{C}_{9} \mathrm{H}_{10} \mathrm{Br}_{2}$) when heated with excess sodamide followed by treatment with dilute HCl gives $[\mathrm{Q}]$. On warming $[\mathrm{Q}]$ with mercuric sulphate and dilute sulphuric acid yield $[R]$ which gives positive lodoform test but negative Tollen's test. The compound $[\mathrm{P}]$ is :

Consider the following reactions sequence  When the product (P) is subjected to Carius analysis using $AgNO_3$, $1.0$ g of the product (P) will produce _______ g of the precipitate of AgBr. (Nearest Integer) (Given: molar mass in g mol$^{-1}$ C : 12, H : 1, O : 16, N : 14, Br : 80, Ag : 108)

Match the LIST-I with LIST-II <table class="pyq-table"><tbody><tr><th>List-I (Reaction)</th><th>List-II (Mechanism)</th></tr><tr><td>A. Williamson Synthesis</td><td>I. Electrophilic addition</td></tr><tr><td>B. Friedel Craft Reaction</td><td>II. Free radical substitution</td></tr><tr><td>C. Bromination of vinyl benzene</td><td>III. Nucleophilic substitution</td></tr><tr><td>D. Chlorination of toluene in light</td><td>IV. Electrophilic substitution</td></tr></tbody></table> Choose the correct answer from the options given below:

$R_f$ value for $2$-methylpropene in a solvent system (Ethyl acetate + ether) is $0.42$. $2$-methylpropene is treated with dilute $\text{H}_2\text{SO}_4$ to give major organic product (X). $R_f$ value for (X) in the same solvent system under identical condition will be:

For the following Friedel Craft's alkylation reaction, which of the statements are correct?  A. Major product is n-propyl benzene. B. iso-propyl carbocation intermediate is also generated. C. Multiple substitution is inevitable. D. Introducing electron-donating substituent on benzene will not produce any alkyl benzene. Choose the correct answer from the options given below:

Identify the incorrect statements.  Choose the correct answer from the options given below:

Identify the colour of compound $'X'$ in the sequence of the reaction. 

' $x$ ' is the product which is obtained from propanenitrile and stannous chloride in the presence of hydrochloric acid followed by hydrolysis. ' $y$ ' is the product which is obtained from the but-2-ene by the ozonolysis followed by hydrolysis. From the following, which product is not obtained when one mole of ' $x$ ' and one mole of ' $y$ ' react with each other in the presence of alkali followed by heating?

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

In sulphur estimation, $2.0 \times 10^{-3}$ mol of an organic compound (X) (molar mass $76$ g mol$^{-1}$) gave $0.4813$ g of barium sulphate (molar mass $233$ g mol$^{-1}$). The percentage of sulphur in the compound (X) is ______ $\times 10^{-1}$ % (Nearest integer)

$RMgI$ when treated with ice cold water liberated a gas which occupied $1.4\text{ dm}^3/\text{g}$ at STP. The gas produced is further reacted with iodine in presence of $HIO_3$ to give compound (X). Compound (X) in presence of Na and dry ether produced compound (Y). Molar mass of compound (Y) is _______ $\text{g mol}^{-1}$. (Nearest integer)

An organic compound " P " of molecular formula $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{3}$ gives positive Iodoform test but negative Tollen's test. When " P " is treated with dilute acid, it produces " Q ". " Q " gives positive Tollen's test and also iodoform test. The structure of " P " is :

The correct statements are : A. Activation energy for enzyme catalysed hydrolysis of sucrose is lower than that of acid catalysed hydrolysis. B. During denaturation, secondary and tertiary structures of a protein are destroyed but primary structure remains intact. C. Nucleotides are joined together by glycosidic linkage between $\mathrm{C}_{1}$ and $\mathrm{C}_{4}$ carbons of the pentose sugar. D. Quaternary structure of proteins represents overall folding of the polypeptide chain. Choose the correct answer from the options given below :

Which of the following reactions is an example of Wurtz reaction?

 Compound (X) [styrene] is subjected to the sequence of reactions as shown above: (i) $Br_2/CHCl_3$ (ii) $NaNH_2$ excess (iii) $CH_3I$ (iv) $H_2$, $Na/NH_3$ $(l)$, giving Major Product (Y). Molar mass of the major product (Y) formed is ______ g mol$^{-1}$. (Given molar mass in g mol$^{-1}$ C:$12$, H: $1$, O: $16$)