NEET UG Chemistry — Organic Chemistry previous year questions with solutions.
The incorrect method to synthesize benzaldehyde is:
The incorrect statement regarding chirality is :
Match List - I with List - II. <table class="pyq-table"><tbody><tr><td colspan="2" rowspan="1">List - I (Products formed)</td><td colspan="2" rowspan="1">List - II (Reaction of carbonyl compound with)</td></tr><tr><td>(a)</td><td>Cyanohydrin</td><td>(i)</td><td>${\mathrm{NH}}_{2}\mathrm{OH}$</td></tr><tr><td>(b)</td><td>Acetal</td><td>(ii)</td><td>${\mathrm{RNH}}_{2}$</td></tr><tr><td>(c)</td><td>Schiff's base</td><td>(iii)</td><td>alcohol</td></tr><tr><td>(d)</td><td>Oxime</td><td>(iv)</td><td>$\mathrm{HCN}$</td></tr></tbody></table>Choose the correct answer from the options given below:
Which of the following sequence of reactions is suitable to synthesise chlorobenzene?
Compound $X$ on reaction with ${O}_{3}$ followed by $\mathrm{Zn}/{H}_{2}O$ gives formaldehyde and $2$-methyl propanal as products. The compound $X$ is:
Given below are two statements: Statement I: In Lucas test, primary, secondary and tertiary alcohols are distinguished on the basis of their reactivity with conc. $\mathrm{HCl}+{\mathrm{ZnCl}}_{2}$, known as Lucas Reagent. Statement II: Primary alcohols are most reactive and immediately produce turbidity at room temperature on reaction with Lucas Reagent. In the light of the above statements, choose the most appropriate answer from the options given below:
The product formed from the following reaction sequence is 
The products $A$ and $B$ in the following reaction sequence are: 
Given below are two statements: Statement I: Primary aliphatic amines react with ${\mathrm{HNO}}_{2}$ to give unstable diazonium salts. Statement II : Primary aromatic amines react with ${\mathrm{HNO}}_{2}$ to form diazonium salts which are stable even above $300K$. In the light of the above statements, choose the most appropriate answer from the options given below
Match the regents (List-I) with the product (ListII) obtained from phenol.  Choose the correct answer from the options given below :
Match List-I with List-II : $\begin{array}{|l|l|} \hline \text{List-I } & \text{List-II } \\ \text{(Reaction) } & \text{(Product formed) } \\ \hline \text{(a) Gabriel synthesis} & \text{(i) Benzaldehyde} \\ \text{(b) Kolbe synthesis} & \text{(ii) Ethers} \\ \text{(c) Williamson synthesis} & \text{(iii) Primary amines} \\ \text{(d) Etard synthesis} & \text{(iv) Salicyclic acid} \\ \hline \end{array}$ Choose the correct answer from the options given below :
Predict the order of reactivity of the following four isomers towards $\mathrm{S}_{\mathrm{N}} 2$ reaction. (I) $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{CH}_2 \mathrm{Cl}$ (II) $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CH}(\mathrm{Cl}) \mathrm{CH}_3$ (III) $\left(\mathrm{CH}_3\right)_2 \mathrm{CHCH}_2 \mathrm{Cl}$ (IV) $\left(\mathrm{CH}_3\right)_3 \mathrm{CCl}$
Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): Chlorine is an electron withdrawing group but it is ortho, para directing in electrophilic aromatic substitution. Reason (R) : Inductive effect of chlorine destabilises the intermediate carbocation formed during the electrophilic substitution, however due to the more pronounced resonance effect, the halogen stabilises the carbocation at ortho and para positions. In the light of the above statements, choose the most appropriate answer from the options given below:
Which one of the following is not formed when acetone reacts with $2$-pentanone in the presence of dilute $\mathrm{NaOH}$ followed by heating?
Which of the following is the most stable carbocation?
Which compound amongst the following is not an aromatic compound?
The simplest amino acid is
The hybridization of carbon in benzene is
The intermediate compound $'X'$ in the following chemical reaction is: 
Dihedral angle of least stable conformer of ethane is:
 Consider the above reaction and identify the missing reagent/chemical.
The product formed in the following chemical reaction is: 
The correct structure of $2,6$ - Dimethyldec-$4$-ene is:
The RBC deficiency is deficiency disease of: