Question Bank Directory

The name of the electrophile involved in the below reaction (Reimer-Tiemann reaction) is:

The first ionization enthalpies of elements X and Y are 419 kJ mol⁻¹ and 590 kJ mol⁻¹, respectively and the second ionization enthalpies of X and Y are 3069 kJ mol⁻¹ and 1145 kJ mol⁻¹, respectively. The correct statement is:

Ethylbenzene is obtained from phenyl methyl ketone by using:

Given is a reaction for your reference: The final product [C] is:

A siren emitting a sound of frequency $800\text{ Hz}$ moves away from an observer towards a cliff at a speed of $15\text{ ms}^{-1}$. The frequency of sound that the observer hears in the echo reflected from the cliff will be: (Take, velocity of sound in air = $330\text{ ms}^{-1}$)

The first ionization potential of Be and B will be:

The IUPAC name of an element with atomic number 119 is:

A tuning fork with a frequency of $800 \text{ Hz}$ produces resonance in a resonance column tube with the upper end open and the lower end closed by the water surface. Successive resonances are observed at lengths of $9.75 \text{ cm}$, $31.25 \text{ cm}$, and $52.75 \text{ cm}$. The speed of the sound in the air is:

Which of the following does not give nucleophilic substitution with alcohol?

The correct order of 1st IP (ionization potential) among the following elements Be, B, C, N, O is:

Given below are two statements: Assertion (A): A glass tube partially filled with water represents an open organ pipe. Reason (R): The open end corresponds to an antinode and the end in contact with water, to a node. In the light of the above statements, choose the correct answer from the options given below:

The correct order of ionic radii is:

Reaction of phenol with chloroform in the presence of dilute sodium hydroxide finally introduces which one of the following functional groups?

The $4^{\text{th}}$ overtone of a closed organ pipe is the same as that of the $3^{\text{rd}}$ overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is:

The compound that is used as antifreeze in automobile radiators is:

The length of the string of a musical instrument is $90\text{ cm}$ and has a fundamental frequency of $120\text{ Hz}$. Where should it be pressed to produce a fundamental frequency of $180\text{ Hz}$?

n-Propyl alcohol and Isopropyl alcohol can be chemically distinguished by which reagent:

The reagents with which glucose does not react to give the corresponding test/products are: A. Tollen's reagent B. Schiff's reagent C. $\text{HCN}$ D. $\text{NH}_2\text{OH}$ E. $\text{NaHSO}_3$ Choose the correct option:

For the second-period elements, the correct increasing order of first ionisation enthalpy is:

Match the compounds of Xe in Column I with the molecular structure in Column II. Column-I (a) $XeF_{2}$ (b) $XeF_{4}$ (c) $XeO_{3}$ (d) $XeOF_{4}$ Column-II (i) Square planar (ii) Linear (iii) Square pyramidal (iv) Pyramidal