Class 12th

The major product in the reaction

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Raj Pandey

Contributor-Level 9

Base is tert-butoxide thus favours elimination with 3° alkyl halide and gives alkene

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3 months ago

Out of the following which type of interaction is responsible for the stabilization of a-helix structure of proteins?

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alok kumar singh

Contributor-Level 10

For stabilization of a - helix structure of protein, H-bonding is responsible which is in between group present in protein.

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3 months ago

Consider a p-n junction diode which has a potential drop of 0.5 V which is to be taken independent of current (under forward bias). If we want to use 1.5 V cell to forward bias the diode then what should be the value of resister (in Ω) used in series with the diode so that current may not exceed 10 mA, and hence may work safely.

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Contributor-Level 10

1R + 0.5 = 1.5
1R = 1
R = 1/10 = 100Ω

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3 months ago

The IUPAC name of ethylidene chloride is:

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Raj Pandey

Contributor-Level 9

Ethylidene chloride is

1, 1 Dichloro ethane.

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3 months ago

In the colour coding system of carbon resistors, the tolerance (in %) shown by gold band is ____.

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Contributor-Level 10

Gold band is equal to 5% tolerance

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3 months ago

A radioactive sample decays with a constant of (1/3)logₑ2 s⁻¹. If initially there are 200 nuclei present, find the number of nuclei decayed during the first 9 seconds.

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Contributor-Level 10

t? , half life = (log?2)/λ = 3 s
Initially 200 nuclei were there
After 3 half-lives, 9 seconds,
No. of nuclei = (1/2³) (200) = 25
Therefore, the number of nuclei that decayed = 200 – 25 = 175

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3 months ago

Class 12th Electromagnetic Induction

In the following reaction the reason why meta-nitro product also formed is:

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alok kumar singh

Contributor-Level 10

During nitration of aniline, meta product is also formed, it is because of due to presence of anilinium ion. In anilium $- \overset{+}{N} H_{3}$ group is meta directing group.

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3 months ago

Two fixed long parallel horizontal rails, a distance 1 m apart are joined at one end by a resistance 1Ω . A rod AB of negligible resistance slides towards the resistance. A magnetic field of magnitude 4T perpendicular to the plane of rails exists. Find the current flowing (in Ampere) in the resistance, at an instant when the velocity of the rod is 2 m/s.

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Contributor-Level 10

EMF induced = BLV = 4 * 2 * 1 = 8V
Current produced = BLV/R = 8/1 = 8A

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3 months ago

Two capacitros are fully charged by a battery as shown in the figure.

If the capacitors are disconnected from battery and plate 1 is connected to plate 4 & plate 2 to plate 3, then find the potential difference (in volts) across capacitors finally.

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Contributor-Level 10

Charge initially on capacitor 1=10µC
Charge initially on capacitor 2=20µC
Finally the potential difference across both capacitor will be equal.
Let us assume that to be V.
1V + 2V = +10
V = 10 / 3 = 3.33V

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3 months ago