List of top Chemistry Questions

Arrange the following compounds in increasing order of reactivity towards nucleophilic addition reaction. (I)$C_6H_5COCH_3$ (II) $CH_3 CO-C_2H_5$ (III)$C_6H_5CHO$ (IV) $Cl-CH_2 - CHO$
Electron affinity is positive, when
The composition of a sample of wustite is $Fe _{0.93} O$. What percentage of the iron is present in the form of Fe (III)?
What would be the expected product of the reaction of propyne with$ Br_{2}/H_{2}O$ if the mechanism of this reaction is analogous to that of propene?
When acidified $K _{2} Cr _{2} O _{7}$ solution is added to $Sn ^{2+}$ salts, then $Sn ^{2+}$ changes to
The strongest acid among the following is
On commercial scale phenol is obtained from chlorobenzene. The chlorobenzene needed for the purpose is prepared byRaschig?? process. Which one of the following is Raschig?? process?
At $300 \,K , 36\, g$ of glucose present per litre in its solution has an osmotic pressure of $4.98$ bar. If the osmotic pressure of solution is $1.52$ bar at the same temperature, what would be its concentration?
How many $mL$ of $0.125\, M \,Cr ^{3+}$ must be reacted with $12.00 \,mL$ of $0.200\, M\, MnO _{4}^{-}$if the redox products are $CrO _{7}^{2-}$ and $Mn ^{2+}$ ?
Grignard reagents and organolithium compounds on addition to dry ice separately, followed by hydrolysis gives
According to Hardy schulze law, the flocculating power of an ion increases with
Hardening of leather in tanning industry is based on
For isothermal expansion of an ideal gas, the correct combination of the thermodynamic parameters will be
Empirical formula of a compound is $CH_2O$ and its molecular mass is $90$, the molecular formula of the compound is
: $p$-chlorobenzoic acid is stronger acid than benzoic acid. : Chlorine has electron donating resonance $(+ R )$ effect.
In diborane, the number of electrons that account for bonding in the bridges is
In borax the number of $B-O-B$ links and $B-OH$ bonds present are, respectively,
Which of the following is the weakest base?
Which of the following sets of quantum numbers is not possible?
Which one of the following is a strong base?
Which one of the following is ferromagnetic?
Who proposed dual nature of electron?
Wilkinson's catalyst is used for
Wurt'z reaction of methyl iodide yields an organic compound X. Which of the following reaction also yields X?
The volume occupied by $ 16\,g $ of oxygen gas at $ STP $ is