Solve karo badiya banaya hai sawal taaza taaza khas aapke liye multi concept multiple subject and multiple choice advanced level

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KBCC 02 answers with solution

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KBCC # 03
The difference of number of sigma bonds in benzene and number of pi electrons in cyclopentadienyl anion is 'n'. An isomer 'A' of alkane CnH2n+2 contains 2 tertiary H atoms. On monochlorination, 'A' gives a major product 'B', and on monobromination, it gives a major product 'C'.

A. In DNA structure, the number of hydrogen bonds stabilizing a Guanine-Cytosine (G-C) base pair is 'n'/2, while the number stabilizing an Adenine-Thymine (A-T) pair is 'n'/3.

B. Due to significant steric hindrance, product 'C' is highly resistant to SN1 reactions but readily undergoes solvolysis via an SN2 mechanism in a protic solvent like ethanol.

C. Consider the reaction of B with NaI in acetone solvent the time required for the concentration of B to decrease from 0.2 M to 0.1 M is observed to be 60 minutes. If the reaction of B started with an initial concentration of 0.8 M, then the first half-life is 30 minutes

D. a salt containing a cation Fe^x+ (where x = n/2 )is subjected to qualitative analysis. the original salt solution is treated with ammonium thiocyanate (NH4SCN) solution, a blood-red coloration appears.

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Practice Sheet- Isomerism Only Questions_NEET Xtreme Telegram Sheet_NEET 2026_Pankaj Sir_Sanjeet_Atul.pdf

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KBCC # 04

(Multiple answer correct)

The hybridization of P in solid PBr₅ is SPⁿ. A chiral cyclic ether of molecular formula CₙH₂ₙO on reaction with LAH followed by water gives an alcohol A. A on reaction with SOCl₂ gives B, and the same alcohol A on reaction with Lucas reagent gives B along with turbidity in a few minutes.


Question: Based on the information in the passage, which of the following statements is/ are correct?


A. The nucleophilic hydride (H⁻) attacks the more sterically hindered chiral carbon center, leading to the formation of the achiral alcohol A.


B. In the Bohr model for the hydrogen atom, the ratio of the energy of an electron in the quantum level n to the energy of an electron in the ground state is 1/9.


C. The number of carbon atoms, 'n', in the chiral cyclic ether is a positive integer root of the cubic equation:

x^3 - 4x^2 + x + 6 = 0


D. The alcohol A is chiral and is a structural isomer of the simplest aldose sugar, glyceraldehyde (C₃H₆O₃).