NEET UG Chemistry — Organic Chemistry previous year questions with solutions.
Trichloroacetaldehyde, $\mathrm{CCl}_3 \mathrm{CHO}$ reacts with chlorobenzene in presence of sulphuric acid and produces -
$$ \text { Predict the product : } $$ 
Which one of the following statements is not true?
The stability of carbanions in the following  is in the order of
A strong base an abstract an $\alpha$-hydrogen from
For the gas phase reaction, $\mathrm{PCl}_5(g) \rightleftharpoons \mathrm{PCl}_3(g)+\mathrm{Cl}_2(g)$ which of the following conditions are correct?
 $A$ (Predominantly) is
Which one of the following is an amine hormone?
Acetophenone when reacted with a base, $\mathrm{C}_2 \mathrm{H}_5 \mathrm{ONa}$, yields a stable compound which has the structure?
$$ \text { In a } \mathrm{S}_{\mathrm{N}} 2 \text { substitution reaction of the type } $$ $$ \mathrm{R}-\mathrm{Br}+\mathrm{Cl}^{-} \stackrel{\mathrm{OMF}}{\longrightarrow} \mathrm{R}-\mathrm{Cl}+\mathrm{Br}^{-} $$ Which one of the following has the highest relative rate?
The correct order of increasing bond angles in the following triatomic species is
$$ \text { In a reaction of ani line a coloured product } \mathrm{C} \text { was obtained. } $$  $$ \text { The structure of } \mathrm{C} \text { would be } $$
How many moles of lead (II) chloride will be formed from a reaction between $6.5 \mathrm{~g}$ of $\mathrm{PbO}$ and $3.2 \mathrm{~g}$ of $\mathrm{HCl}$ ?
The values of \(K_{p_1}\) and \(K_{p_2}\) for the reactions \(X \rightleftharpoons Y+Z\) ...(i) and \(A \rightleftharpoons 2 B\) ...(ii) are in ratio of \(9: 1\). If degree of dissociation of \(X\) and \(A\) be equal, then total pressure at equilibrium (i) and (ii) are in the ratio
The dissociation equilibrium of a gas $A B_2$ can be represented as $2 A B_2(g) \rightleftharpoons 2 A B(g)+B_2(g)$ The degree of dissociation is ' $x$ ' and is small compared to 1. The expression relating the degree of dissociation $(x)$ with equilibrium constant $K_P$ and total pressure $p$ is
 A (predominantly) is
In DNA, the complimentary bases are
The stability of carbanions in the following (1) $\mathrm{RC} \equiv \stackrel{\ominus}{\mathrm{C}}$ (2) (3)\(\mathrm{R}_2 \mathrm{C}=\stackrel{\ominus}{\mathrm{C}}\mathrm{H}\) (4) $\mathrm{R}_3 \mathrm{C}-\stackrel{\ominus}{\mathrm{C}} \mathrm{H}_2$ is in the order of
How many stereoisomers does the molecules have? $\mathrm{CH}_3 \mathrm{CH}=\mathrm{CHCH}_2 \mathrm{CHBrCH}_3$
Standard free energies of formation (in $\mathrm{kJ} / \mathrm{mol}$ ) at $298 \mathrm{~K}$ are $-237.2,-394.4$ and -8.2 for $\mathrm{H}_2 \mathrm{O}(l) \mathrm{CO}_2(g)$ and pentane $(g)$, respectively. The value of $E_{\text {cell }}^0$ for the pentane-oxygen fuel cell is
The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of
Which one of the following is most reactive towards electrophilic attack?
In a $S_{\mathrm{N}} 2$ substitution reaction of the type $\mathrm{R}-\mathrm{Br}+\mathrm{Cl}^{-} \stackrel{\mathrm{DMF}}{\longrightarrow} \mathrm{R}-\mathrm{Cl}+\mathrm{Br}^{-}$, which one of the following has the highest relative rate?
Equal volumes of three acid solutions of $\mathrm{pH} 3,4$ and 5 are mixed in a vessel. What will be the $\mathrm{H}^{+}$ ion concentration in the mixture?