Identify the product \([\text{B}]\) in the following reaction.
\(\text{CH}_3\text{CH}_2-\text{C} \equiv \text{CH} + \text{HCl} \rightarrow \text{A} \xrightarrow{\text{HI}} [\text{B}]\)

Answer the question on the basis of passage given below:
Adsorption is the phenomenon of attracting and retaining the molecules of a substance on the surface of a solid resulting into a higher concentration on the surface than in the bulk. The substance adsorbed is known as adsorbate and the substance on which adsorption takes place is called adsorbent. In physisorption adsorbate is held to the adsorbent by weak van der Waals forces and in chemisorption by strong chemical bond.
In coagulation of a positive sol, the flocculating power will be in the order:
A. \(PO _4^{3-}\)
B. \(Cl ^{-}\)
C. \([ Fe ( CN )]^{3-}\)
D. \(SO _4^{2-}\)
Choose the correct answer from the options given below:

A cell is formed by combining given electrodes with \(Zn ^{2+} \mid Zn ( s )\left(E^{\circ}=-0.76 V\right)\). Arrange the following in decreasing order of \(E _{\text {cell }}^{\circ}\).
Cell Notation: \(Zn ( s ) \mid Zn ^{2+} \|\) Given electrode
(A) \(Ag ^{+} \mid Ag ( s ): E^{\circ}=+0.80 V\)
(B) \(Na ^{+} \mid Na ( s ): E^{\circ}=-2.71 V\)
(C) \(Fe ^{2+} \mid Fe ( s ): E^{\circ}=-0.44 V\)
(D) \(Cu ^{+} \mid Cu ( s ): E^{\circ}=+0.52 V\)
Choose the correct answer from the options given below:

The vapour pressures of chloroform, (\(\text{CHCl}_3\)) and dichloromethane (\(\text{CH}_2\text{Cl}_2\)) at 298 K are 400 mm Hg and 615 mm Hg,respectively. What is the mole fraction of \(\text{CHCl}_3\) in vapour phase in solution prepared by mixing 30 g of \(\text{CHCl}_3\) and 45 g of \(\text{CH}_2\text{Cl}_2\) ?

The process used for the conversion of sugar into Ethanol is :

Which is the correct decreasing order of boiling point
A. 1 - Bromoethane
B. 1 - Bromopentane
C. 1 - Bromobenzene
D. 1 - Bromopropane
Choose the correct answer from the options given below:

Ethanol is treated with concentrated sulphuric acid. The product formed is :

Which of the following is more reliable ?

\(\left|\begin{array}{lll}1 & 2 & 3 \\4 & 5 & 6 \\7 & 8 & 9\end{array}\right|=x\left|\begin{array}{ll}2 & 3 \\8 & 9\end{array}\right|+y\left|\begin{array}{ll}1 & 3 \\7 & 9\end{array}\right|+z\left|\begin{array}{ll}1 & 2 \\7 & 8\end{array}\right|\)
Then \(x+y+z\) is:

Match List-I with List-II

List-I	List-II
(A) Faraday's Law	(I) Current induced in a conductor moving perpendicular to a magnetic field
(B) Lenz's Law	(II) Direction of force on a straight current carrying conductor placed perpendicular to a magnetic field
(C) Fleming's right hand rule	(III) Magnitude of induced emf
(D) Fleming's left hand rule	(IV) Direction of induced current

Choose the correct answer from the options given below:

Three capacitors of capacitances 2 \(\mu F\), 3 \(\mu F\) and 6 \(\mu F\) are connected in series. The combination is connected to a 12 V supply. The respective potential differences across them will be

You are sitting in a parked car and you notice a boy running towards the car in the side view mirror of the car. If the boy is running at a constant speed towards you, which option according to you is correct

Read the following passage carefully and answer the given questions.
Theory of Evolution
The evolution of life is a gradual process through which simple organisms are transformed into complex life forms over billions of years. It involves genetic changes, adaptation to the environment, and the emergence of diversity in species. Fossil records provide evidence of extinct life forms and transitional stages. Evolution is influenced by factors such as mutation, genetic recombination, and environmental pressure, shaping the biodiversity we see today. Charles Darwin and Alfred Russel Wallace were pioneering naturalists who developed the theory of evolution by natural selection.
Alfred Russel Wallace, a naturalist, arrived at conclusions similar to Darwin while working in: