List of top Chemistry Questions

Statement-I: RMgX reacts with CO$_2$ followed by acidification to form product, which reacts with NH$_3$/Δ and then reacts with NaOCl to form product which further reacts with CHCl$_3$/NaOH and final product is R–N≡C.
Statement-II: R–N≡C on hydrolysis gives RCOOH.

Aniline (9.3 g) on reaction with acetic anhydride forms X (11 g). Find the percentage yield of the reaction.

The correct order of stability of given carbanions is:

Statement (A): Resonating structure with more $\sigma$-bonds charges far apart are more stable.
Statement (B): Unsaturated hydrocarbon shows +I or –I depending upon the group they are attached with.
Statement (C): Carbanion with more % s character are more stable.
Statement (D): In nucleophilic addition to carbonyl group –E (electron-withdrawing) effect is responsible while in electrophilic additions +E is responsible.
Statement (E): Alkene having more alkyl groups have more heat of hydrogenation.
How many statements are correct?

An organic compound contains C, H and O. 0.25 g of organic compound on combustion produces CO$_2$(g) and H$_2$O(l). When residual gases pass through KOH solution, its mass increases by 0.18 g and when passed through anhydrous CaCl$_2$, the increase in mass of CaCl$_2$ is 0.15 g. Find the mass % of oxygen in the organic compound.

Match the List-I and List-II:

Given the reaction sequence:

The percentage of Nitrogen in compound E is:

Correct order of stability is :

Correct sequence of reagent for the given reaction:

When a nitro group is attached to a benzene ring, what effect do we observe towards reactions:

[(I)] Deactivating towards electrophilic substitution
[(II)] Activating towards electrophilic substitution
[(III)] Deactivating towards nucleophilic substitution
[(IV)] Activating towards nucleophilic substitution
Find the correct statements:

Match the list-I and list-II name of reagent.
List-I (1) Baeyer's reagent
(2) Cerric Ammonium nitrate
(3) Tollen's reagent
(4) Neutral FeCl$_3$
List-II (P) Violet colour
(Q) Red
(R) Silver mirror
(S) Pink colour disappears

CH$_3$-C$\equiv$C-CH$_3$ \(\xrightarrow{\text{H}_2/\text{Pd-CaCO}_3}\) (X) \(\xrightarrow{\text{Na/Liq. NH}_3}\) (Y) Select the correct statement:

Which pair among the following compounds have equal number of hyperconjugation:

Compare rate of nitration in decreasing order:

Which of the following reactions yield alcohol as the major product:

An organic compound \(A\) with molecular formula \( \mathrm{C_4H_8O} \) gives a positive iodoform test and on oxidation forms a compound \(B\) which does not reduce Tollens' reagent. Identify compound \(A\).

Observe the following reaction sequence:
\[ \text{C}_4\text{H}_8 \xrightarrow{\text{HCl}} \text{C}_4\text{H}_7\text{Cl} \xrightarrow{\text{NH}_3} \text{C}_4\text{H}_9\text{NH}_2 \xrightarrow{\text{NaNO}_2 + \text{HCl}} \text{C}_4\text{H}_9\text{OH} \] Which of the following is the correct structure for A, B, and C?

Consider the following reaction sequence:

The organic products ‘A’ and ‘B’ can be separated by:

All possible isomers of C$_3$H$_7$Br when reacted with aq. KOH. Find out total number of optically active products (without rearrangement).

Find correct order of acidic strength in the following reaction products \(P, Q, R \& S\):

Which of the following are {insoluble in alkali} when reacted with Hinsberg reagent?

What is the mass (in mg) of final product (C)? \[ \text{CH}_3\text{C}\text{NO}_2 \xrightarrow{\text{(i) Sn/HCl}} \text{CH}_3\text{C}\text{OOCOCH}_3 \xrightarrow{\text{(ii) pH neutral}} \text{CH}_3\text{C}\text{OH} \xrightarrow{\text{Br}_2/\text{Ac}} \text{Product (C)} \] Given: 137 mg of the starting compound.

‘X’ \(\xrightarrow[(2)\ \mathrm{H_2O}]{(1)\ \mathrm{NaNO_2/HCl}}\) \(\xrightarrow[\ ]{\mathrm{NaOH/I_2}}\) ‘Y’ (gives positive iodoform test):
X has \(%C = 65.75%\), \(%H = 15.25%\), \(%N = 19%\).
Identify ‘X’ among the following: