It appear as dim points in the night sky​

a)[tex]CH_{3}- C[/tex]≡CH + 2HBr → [tex]CH_{3}-C(Br)_{2}-CH_{3}[/tex]

• a) Propyne reacts with Hydrogen bromide to give  2 2-Dibromopropane. The addition of hydrogen bromide results in the formation of geminal halides.
• The reaction is as follows:

       [tex]CH_{3}- C[/tex]≡CH + 2HBr → [tex]CH_{3}-C(Br)_{2}-CH_{3}[/tex]

• b)To form acetophenone(1-phenylethane-1-one), benzene reacts with [tex]CH_{3}OCl[/tex] in the presence of aluminium chloride and hydrogen chloride.
• It is a type of direct reaction. Please refer to the attached image for the conversion.
• ii) The most widely used method to form chlorobenzene from Benzene is the electrophilic substitution reaction.
• Here, the electrophile( Chlorine) attacks the hydrogen atom on the benzene ring in the presence of Ferric chloride and substitutes it.
• HCl is formed as a by-product in the reaction.Please refer to the image for the chemical reaction.

Answer:

(a) Propyne is converted into 2,2-Dibromopropane using hydrogen bromide

(b) Benzene is converted into acetophenone using acyl chloride and lewis acid

(ii) Chlorobenzene is made from benzene by using chlorine gas and any lewis acid.

Explanation:

(a) Propyne will be converted to 2,2-Dibromopropane by adding two times HBr.

(b) Benzene is converted into acetophenone by using acyl chloride in the presence of any lewis acid.

(ii) Benzen is converted into chlorobenzene via electrophilic substitution method by adding chlorine gas in the presence of any lewis acid.

Explanation:

Imagine a device that could identify the position its position over the course of time.

Believe it or not, there is such a device - it's called a ticker tape timer. Before the advent of computers in Physics labs, a common way of analyzing the motion of objects in physics labs was to perform a ticker tape analysis. A long tape was attached to a moving object and threaded through a device that placed a tick upon the tape at regular intervals of time - say every 0.10 second. As the object moved, it dragged the tape through the "ticker," thus leaving a trail of dots. The trail of dots provided a history of the object's motion and therefore a representation of the object's motion.

Video of Ticker Tape Analysis

Dot Diagrams

While the use of ticker tape analyses in Physics labs has mostly been replaced by the use of computer-interfaced motion detectors, the use of ticker tapes or motion diagrams still persists in our Physics curriculum due to the visual nature of representing an object's motion. Such diagrams are referred to as dot diagrams, motion diagrams, oil drop diagrams, and (still) ticker tape diagrams.

The distance between dots on a dot diagram represents the object's position change during that time interval. A large distance between dots indicates that the object was moving fast during that time interval. A small distance between dots means the object was moving slow during that time interval. Dot diagrams for a fast- and slow-moving object are depicted below.

The analysis of a dot diagram will also reveal if the object is moving with a constant velocity or accelerating. A changing distance between dots indicates a changing velocity and thus an acceleration. A constant distance between dots represents a constant velocity and therefore no acceleration. Dot diagrams for objects moving with a constant velocity and with an accelerated motion are shown below.

freestar

We Would Like to Suggest ...

Sometimes it isn't enough to just read about it. You have to interact with it! And that's exactly what you do when you use one of The Physics Classroom's Interactives. We would like to suggest that you combine the reading of this page with the use of our Name That Motion Interactive. It is found in the Physics Interactive section and allows a learner to apply concepts of speed, velocity, acceleration and ticker tape diagrams

Next Section:

Vector Diagrams

Jump To Next Lesson:

Meaning of Shape for a p-t Graph

एक वस्तु का द्रव्यमान 10 kg है. पृथ्वी पर इसका भार क्या होगा ? w=(10kg)(9.8m/s2)=98kgm/s2=98N.

Answer:

VIOLET

Explanation:

BECAUSE IT IS THE VIBYOR IN PRISM

Answer:

Red has the maximum and violet has the minimum speed in a glass prism.