List of top Chemistry Questions

Compound ‘X’ with molecular formula \( C_4H_9Br \) reacts with aqueous KOH to give an alcohol. The rate of this reaction depends only on the concentration of compound ‘X’. When an optically active isomer ‘Y’ of the compound ‘X’ was treated with aqueous KOH solution, the rate of reaction was found to be dependent on concentration of compound ‘Y’ and aqueous KOH both.

22(a). Write down the structural formula of both ‘X’ and ‘Y’.

निम्नलिखित दो अभिक्रियाएँ एक ही दुर्गंधयुक्त उत्पाद Z देती हैं। 
Reaction 1: C\(_2\)H\(_5\)Cl \(\xrightarrow{X}\) Z 
Reaction 2: C\(_2\)H\(_5\)NH\(_2\) \(\xrightarrow{Br_2, NaOH}\) Y \(\xrightarrow{CHCl_3/\text{एथेनॉली } KOH, \Delta}\) Z 
X और Z, क्रमशः हैं: 
 

Deficiency of which of the following essential vitamins in the human diet causes a reduction in intestinal calcium absorption, leading to the bone-softening childhood skeletal deformity known as Rickets?
According to the structural constraints of Valence Bond Theory (VBT), which of the following hybridization geometries and magnetic configurations accurately describes the low-spin coordination complex ion \( [\text{Fe}(\text{CN})_6]^{4- \)? (Atomic Number of \( \text{Fe} = 26 \))}
When an aqueous solution of an electrolyte is progressively diluted by adding more solvent water, how do its Specific Conductivity (\( \kappa \)) and Molar Conductivity (\( \Lambda_m \)) respond?
Benzene reacts with a mixture of carbon monoxide (\( \text{CO} \)) and hydrogen chloride (\( \text{HCl} \)) gas in the presence of an anhydrous aluminium chloride (\( \text{AlCl}_3 \)) catalyst to yield Benzaldehyde. This organic transformation is officially known as the:
Which of the following oxidation state configurations represents the most common, energetically stable, and dominant oxidation state exhibited by nearly all the Lanthanoid elements across the f-block series?
An organic primary amide is treated with bromine (\( \text{Br}_2 \)) and an aqueous solution of sodium hydroxide (\( \text{NaOH} \)) to yield a primary amine. Which of the following statements correctly describes this transformation (Hofmann Bromamide Degradation)?
What are the exact constituent monosaccharide units and the specific structural glycosidic linkage present inside a standard molecule of Lactose (Milk Sugar)?
Which of the following coordination complex compounds is officially classified as a 'Heteroleptic Complex'?
Aldehydes and ketones react with semicarbazide (\( \text{NH}_2\text{NHCONH}_2 \)) in a weakly acidic medium to form crystalline semicarbazone derivatives. Which of the three nitrogen atoms in a semicarbazide molecule acts as the primary nucleophilic center during this reaction?
Which of the following liquid mixtures forms an ideal solution that strictly obeys Raoult's Law across the entire concentration range at a constant temperature?
\(10 \text{ g}\) each of \(\text{CH}_4\) and \(\text{O}_2\) are kept in cylinders of same volume under same temperature, give the pressure ratio of two gases:
In a cyclic \(pV\) process forming a square loop from \((p = 1 \text{ atm}, V = 2\text{L})\) to \((p = 3 \text{ atm}, V = 4\text{L})\), then, the net heat absorbed by the gas is:
The temperature in K at which \(\Delta G = 0\), for a given reaction with \(\Delta H = -20.5 \text{ kJ mol}^{-1}\) and \(\Delta S = -50.0 \text{ J K}^{-1} \text{ mol}^{-1}\) is:
Ionisation energy of H-atom is \(13.6 \text{ eV}\). The wavelength of the spectral line emitted when an electron in \(\text{Be}^{3+}\) comes from \(5^{\text{th}}\) energy level to \(2^{\text{nd}}\) energy level is:
The degeneracy of a hydrogen atom whose energy equals \(-R_H/16\) is:
If the de-Broglie wavelength of a particle of mass (\(m\)) is \(100\) times its velocity, then its value in terms of its mass (\(m\)) and Planck's constant (\(h\)) is:
The density (in g mL\(^{-1}\)) of a \(3.60 \text{ M}\) sulphuric acid solution that is \(29\%\) \(\text{H}_2\text{SO}_4\) (molar mass \(= 98 \text{ g mol}^{-1}\)) by mass will be:
If \(20 \text{ g}\) of \(\text{CaCO}_3\) is treated with \(100 \text{ mL}\) of \(20\%\) \(\text{HCl}\) solution, the amount of \(\text{CO}_2\) produced is:

Which one among the following compounds will most readily be dehydrated under acidic condition? 

Consider the following reaction: \[ \text{Zn}_{(s)} + \text{Ag}_2\text{O}_{(s)} + \text{H}_2\text{O}_{(l)} \rightarrow \text{Zn}^{2+}_{(aq)} + 2\text{Ag}_{(s)} + 2\text{OH}^-_{(aq)} \] Given: \[ E^\circ_{\text{Ag}^+/\text{Ag}} = 0.80 \text{ V} \] \[ E^\circ_{\text{Zn}^{2+}/\text{Zn}} = -0.76 \text{ V} \] \[ 1F = 96500 \text{ C mol}^{-1} \] $\Delta G^\circ$ for above reaction is:

नीचे दिए गए अर्ध सेल का वि.वा. बल (emf) परिकलित कीजिए:

Which of the following is not a periodic property?
The number of radial nodes in 3s and 2p orbitals, respectively are