Chemistry Organic Chemistry questions from NEET UG 2008.
A strong base an abstract an $\alpha$-hydrogen from
A strong base can abstract an $\alpha$-hydrogen from
Acetophenone when reacted with a base, $\mathrm{C}_2 \mathrm{H}_5 \mathrm{ONa}$, yields a stable compound which has the structure?
Base strength of a. $\mathrm{H}_3 \mathrm{CC°H}_2$ b. $\mathrm{H}_2 \mathrm{C}=\mathrm{CH}$ c. $\mathrm{H}-\mathrm{C}=\mathrm{C}^{\circ}$ is in the order of
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?
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?
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 $\mathrm{HCl}$ ?
How many stereoisomers does the molecules have? $\mathrm{CH}_3 \mathrm{CH}=\mathrm{CHCH}_2 \mathrm{CHBrCH}_3$
In a reaction of aniline a coloured product $C$ was obtained.  $\ ext {The structure of } C \text { would be}$
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?
In DNA, the complimentary bases are
$$ \text { In a reaction of ani line a coloured product } \mathrm{C} \text { was obtained. } $$  $$ \text { The structure of } \mathrm{C} \text { would be } $$
 $A$ (Predominantly) is
 A (predominantly) is
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 correct order of increasing bond angles in the following triatomic species is
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
The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of
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
The stability of carbanions in the following  is in the order of
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
$$ \text { In a } \mathrm{S}_{\mathrm{N}} 2 \text { substitution reaction of the type } $$ $$ \mathrm{R}-\mathrm{Br}+\mathrm{Cl}^{-} \stackrel{\mathrm{OMF}}{\longrightarrow} \mathrm{R}-\mathrm{Cl}+\mathrm{Br}^{-} $$ Which one of the following has the highest relative rate?
Which one of the following is an amine hormone?
Which one of the following is most reactive towards electrophilic attack?
Which one of the following statements is not true?
Which one the following is most reactive towards electrophilic attack?