HARD
11th CBSE
IMPORTANT
Earn 100

Which of the following compounds will not exist as resonance hybrid. Give reason for your answer:

(i) CH3OH        (ii) R-CONH2    (iii) CH3CH=CHCH2NH2

Important Questions on Organic Chemistry – Some Basic Principles and Techniques

HARD
11th CBSE
IMPORTANT

Which of the following compound will not exist as resonance hybrid. Give reason for your answer:

CH3CH=CHCH2NH2

HARD
11th CBSE
IMPORTANT

Resonance structures of propenal are given below. Which of these resonating structure is more stable? Give reason for your answer.

CH2 CH = CHO  CH2-CH=CH-O                    I                                      II

HARD
11th CBSE
IMPORTANT
By mistake, an alcohol (boiling point 97°C) was mixed with a hydrocarbon (boiling point 68°C). Suggest a suitable method to separate the two compounds. Explain the reason for your choice.
HARD
11th CBSE
IMPORTANT

Which of the two structures A and B given below is more stabilised by resonance? Explain.

A CH3COOH  and B CH3COO

MEDIUM
11th CBSE
IMPORTANT

Match the type of mixture of compounds in Column I with the technique of separation/purification given in Column II.

Column I Column II
(i) Two solids which have different solubilities in a solvent and   which do not undergo reaction when dissolved in it. (a) Steam distillation
(ii) Liquid that decomposes at its boiling point
 
(b) Fractional distillation
(iii) Steam volatile liquid
 
(c) Simple distillation
(iv) Two liquids which have boiling points close to each other
 
(d) Distillation under reduced pressure
(v) Two liquids with large difference in boiling points. (e) Crystallization

 

HARD
11th CBSE
IMPORTANT

Match the terms mentioned in Column I with the terms in Column II.

  Column I   Column II
(i) Carbocation (a) Cyclohexane and 1-hexene
(ii) Nucleophile (b) Conjugation of electrons of C-H bond with empty p-orbital present at adjacent positively charged carbon.
(iii) Hyperconjugation (c) sp2 hybridised carbon with the empty p orbital
(iv) Isomers (d) Ethyne
(v) sp  hybridisation (e) Species that can revive a pair of electrons
(vi) Electrophile (f) Species that can supply a pair of electrons
MEDIUM
11th CBSE
IMPORTANT

Match Column I with Column II.

  Column I   Column II
(i) Dumas method (a) AgNO3
(ii) Kjeldahl's method (b) Silica gel
(iii) Carius method (c) Nitrogen gas
(iv) Chromatography (d) Free radicals
(v) Homolysis (e) Ammonium sulphate