CBSE Class 11 Chemistry VBQs Some Basic Concept In Organic Chemistry

CBSE Class 11 Chemistry VBQs Some Basic Concept In Organic Chemistry read and download in pdf. Value Based Questions come in exams for Chemistry in Standard 11 and are easy to learn and helpful in scoring good marks. You can refer to more chapter wise VBQs for Class 11 Chemistry and also get latest topic wise very useful study material as per latest 2021 NCERT book for Class 12 Chemistry and all other subjects for free on Studiestoday designed as per latest Grade 11 CBSE, NCERT and KVS syllabus and examination pattern

                                             UNIT – 12 (Some Basic Concept in Organic Chemistry)

Question 1. Three students Vaibhav,Vishal and Vikas were determining the elements present in given organic compound by Lassaigne’s test. Vaibhav added FeSO4 and dil. H2SO4 acid to Na- extract and observed Prussian blue colour. Vishal was keeping some pieces of sodium metal in his pocket, Vikas asked him not to do so. Now answer the following questions.

(a) Name the element present in the organic compound.

(b) Write the test for chlorine

(c) Write the value associated.

 Ans: (a)Nitrogen

        (b) sodium fusion extract + silver nitrate solution = white ppt

        (c) Scientific attitude/concern for others

Question 2. An organic compound on heating changes directly into vapours without undergoing into liquid state, it is insoluble in water and is commonly used to prevent clothes against moths. It is contaminated with cinnamaldehyde.Naresh, a student of class XI was asked by his teacher how to purify it.Now answer the following questions

(i) Which method of purification would Naresh apply?

(ii) Name the compound and write it’s another use.

(iii) Write the value associated with this.

Ans: (a) Sublimation

       (b) Naphthalene and can be used as freshener

       (c) Scientific attitude

Question 3. Carbon shows a unique property to form a large number of organic compounds. Even towards the end of 19th century the number of organic compounds known was difficult to remember by their common names. In order to systematize the naming of organic compounds IUPAC system of nomenclature was first introduced in 1947and is modified from time to time. Based on these facts now answer the following questions:

(i) Name the property of carbon to link itself to form a large number of compounds.

(ii) Write the IUPAC name of CH3 CH=CH CH (Br) CH3 and trivial name of CH3– C (CH3)2 – CH3.

(iii) Write the value associated with property of carbon.

Ans.(i) Catenation

      (ii) 4-Bromopent-2-ene, Neo-pentane

      (iii) integration / group works

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