Notes | EduRev

JEE Main Mock Test Series 2020 & Previous Year Papers

Created by: Learners Habitat

JEE : Notes | EduRev

The document Notes | EduRev is a part of the JEE Course JEE Main Mock Test Series 2020 & Previous Year Papers.
All you need of JEE at this link: JEE

Question 1: Compare the basicities of
a) H2C = CHCH2NH2, CH3CH2CH2NHand HCº CCH2NH2, and
b) C6H5CH2NH2, cyclohexyl – CH2NH2 and p-NO2C6H4CH2NH2.
Solution:
a) The significant difference among these three bases is the kind of hybrid orbital used by Cb — the more s character it has, the more electron -  withdrawing (by induction) and base weakening it will be. The HO conditions are H2C = CbHCH2NH2(sp2), CH3CbH2CH2NH2(sp3), and HC º CbCH2NH2(sp). The increasing order of electron – attraction is  propargyl > allyl > propyl >, and the decreasing order of basicity is CH3CH2CH2NH2> H2C = CHCH2NH2 > HC º CCH2NH2
b) The decreasing order is
 Notes | EduRev
The Cb is cyclohexyl – CH2NH2 uses sp3 HO’s while Cb in the benzylamines uses spHO’s. The electron withdrawing p-NO2 makes the phenyl ring even more electron–withdrawing and base weakening.

Question 2: A compound X with seven carbon atoms on treatment with Br2 and KOH gives Y. Y gives carbylamine test and upon diazotisation and coupling with phenol gives azodye. X is
(a) C6H5CONH2
(b) CH­3 – (CH2)5 – CONH2
(c) CH3 –C(CH3)2- CH­2 – CH– CONH2
(d) O – CH– C6H4NH2
Answer: a
Solution: Since Y gives coupling reaction after diazotisation it suggest that Y can be aniline or benzener ring substituted aniline. Since Y has been obtained from Hoffmann bromamide it means has – CO NH2 group with benzene ring. Hence it is C6H5CONH2.Hence, the correct option is  (A).

Question 3: A compound (A) when reacted with PCl5 and then with NH3 gave (B), (B) when treated with Br2 and KOH produced (C). (C) on treatment with NaNO2 and HCl at 0°C and the boiling with water forms o-cresol. Compound A is
(a) o-toluic acid   
(b) o-chlorotoluene
(c) o-bromo toluene
(d) m-toluic acid
Answer: a
Solution: The  compound is o-toluic acid, and the reactions involved are
 Notes | EduRev
Hence, the correct option is A.

Offer running on EduRev: Apply code STAYHOME200 to get INR 200 off on our premium plan EduRev Infinity!

Complete Syllabus of JEE

JEE

Dynamic Test

Content Category

Related Searches

video lectures

,

Viva Questions

,

study material

,

Extra Questions

,

Important questions

,

practice quizzes

,

ppt

,

Previous Year Questions with Solutions

,

past year papers

,

MCQs

,

Free

,

Sample Paper

,

Semester Notes

,

Notes | EduRev

,

mock tests for examination

,

Summary

,

Notes | EduRev

,

Exam

,

Objective type Questions

,

Notes | EduRev

,

shortcuts and tricks

,

pdf

;