Organic Chemistry PYQ — Page 14

The incorrect statements regarding geometrical isomerism are : (A) Propene shows geometrical isomerism. (B) Trans isomer has identical atoms/groups on the opposite sides of the double bond. (C) Cis-but-2-ene has higher dipole moment than trans-but-2-ene. (D) 2-methylbut-2-ene shows two geometrical isomers. (E) Trans-isomer has lower melting point than cis isomer. Choose the correct answer from the options given below :

Match List - I with List - II.  Choose the correct answer from the options given below :

 Residue $(\mathrm{A})+\mathrm{HCl}$ (dil) $\rightarrow$ Compound $(\mathrm{B})$ Structure of residue (A) and compound (B) formed respectively is :

The products $A$ and $B$ in the following reactions, respectively are $\mathrm{A} \stackrel{\mathrm{Ag}-\mathrm{NO}_2}{\longleftrightarrow} \mathrm{CH}_3-\mathrm{CH}_2-\mathrm{CH}_2-\mathrm{Br} \xrightarrow{\mathrm{AgCN}} \mathrm{B}$

The carbohydrate "Ribose" present in DNA, is A. A pentose sugar B. present in pyranose from C. in "D" configuration D. a reducing sugar, when free E. in $\propto$-anomeric form Choose the correct answer from the options given below:

0.5 g of an organic compound on combustion gave 1.46 g of $\mathrm{CO}_2$ and 0.9 g of $\mathrm{H}_2 \mathrm{O}$. The percentage of carbon in the compound is _______. (Nearest integer) [Given : Molar mass (in $\mathrm{g} \mathrm{mol}^{-1}$) $\mathrm{C}: 12, \mathrm{H}: 1$, O: 16]

In which pairs, the first ion is more stable than the second? 

Given below are two statements : Statement (I) : Vanillin  will react with NaOH and also with Tollen's reagent. Statement (II) : Vanillin will undergo self aldol condensation very easily. In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements : Statement (I) : Neopentane forms only one monosubstituted derivative. Statement (II) : Melting point of neopentane is higher than n-pentane In the light of the above statements, choose the most appropriate answer from the options given below :

Aman has been asked to synthesise the molecule (x).He thought of preparing the molecule using an aldol condensation reaction. He found a few cyclic alkenes in his laboratory. He thought of performing ozonolysis reaction on alkene to produce a dicarbonyl compound followed by aldol reaction to prepare " x ". Predict the suitable alkene that can lead to the formation of " $x$ ".

Total number of nucleophiles from the following is : \(\mathrm{NH}_3, \mathrm{PhSH},\left(\mathrm{H}_3 \mathrm{C}\right)_2 \mathrm{~S}, \mathrm{H}_2 \mathrm{C}=\mathrm{CH}_2, \stackrel{\ominus}{\mathrm{O}} \mathrm{H}, \mathrm{H}_3 \mathrm{O}^{\oplus},\left(\mathrm{CH}_3\right)_2 \mathrm{CO},\) 

The descending order of basicity of following amines is:  Choose the correct answer from the options given below :

The IUPAC name of the following compound is - 

The products formed in the following reaction sequence are : 

A molecule (" P ") on treatment with acid undergoes rearrangement and gives ("Q"). ("Q") on ozonolysis followed by reflux under alkaline condition gives (" R "). The structure of (" R ") is given below.  The structure of (" $\mathbf{P}^{\prime \prime}$ ) is

Isomeric hydrocarbons $\quad \rightarrow \quad$ negative Baeyer's test (Molecular formula $\mathrm{C}_9 \mathrm{H}_{12}$ ) The total number of isomers from above with four different non-aliphatic substitution sites is -

A tetrapeptide " $x$ " on complete hydrolysis produced glycine (Gly), alanine (Ala), valine (Val), leucine (Leu) in equimolar proportion each. The number of tetrapeptides (sequences) possible involving each of these amino acids is

Given below are two statements : Statement I : Ozonolysis followed by treatment with $\mathrm{Zn}, \mathrm{H}_2 \mathrm{O}$ of cis-2-butene gives ethanal.Statement II : The production obtained by ozonolysis followed by treatment with $\mathrm{Zn}, \mathrm{H}_2 \mathrm{O}$ of 3, 6-dimethyloct-4-ene has no chiral carbon atom. In the light of the above statements, choose the correct answer from the options given below

The correct order of basicity for the following molecules is: 

Identify the essential amino acids from below : (A) Valine (B) Proline (C) Lysine (D) Threonine (E) Tyrosine Choose the correct answer from the options given below :

Which compound would give 3-methyl-6oxoheptanal upon ozonolysis?

The major product $(\mathrm{P})$ in the following reaction is : 

A toxic compound " A " when reacted with NaCN in aqueous acidic medium yields an edible cooking component and food preservative ' $B$ '. " $B$ " is converted to "C" by diborane and can be used as an additive to petrol to reduce emission. "C" upon reaction with oleum at $140^{\circ} \mathrm{C}$ yields an inhalable anesthetic "D". Identify "A", "B", "C" and "D", respectively.

The total number of hydrogen bonds of a DNA-double Helix strand whose one strand has the following sequence of bases is_______. $5^{\prime}$ - G - G-C-A-A-A-T-C-G-G-C-T-A-3'