class 8 ncert science chapter 4 activity 4.2 solutions
Answers
Activity 4.2 Page No. 67
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- Question 1. Calculate the difference in the formulae and molecular masses for:
CH3OH and C2H5OH
C2 H5 OH and C3 H7OH
C3 H7OH and C4 H9OH
Ans:Difference of molecular mass 14U
Difference in molecular formula Ch4
- Question 2. Is there any similarity in these three?
Ans : All these three have alcoholic (-OH) function group.
- Question 3. Arrange these alcohols in the order of increasing carbon atoms to get a family. Can we call this family a homologous series?
Ans : CH3OH, C2H5OH, C3H7OH, C4H9OH.
Yes, It is a homologous series of alkane alcohols as each successive member of the series differs by - CH2 unit from proceeding member
- Quistion 4.Generate the homologous series for compounds containing up to four carbons for the other functional groups given in Table 4.3.
Ans : (i) Homologus series having Choloro (-Cl) functional group: CH3Cl, C2H5Cl, C3H7Cl, C4H9Cl.
(ii) Homologus series having Aldehydes functional group: CH3CHO, C2H5CHO, C3H7CHO, C4H9CHO.
(iii)Homologus series having Ketone functional group: CH2CO, C2H4CO, C3H6CO, C4H8CO.
(iv) Homologus series having Carboxylic acids functional group: HCOOH, CH3COOh, C2H5COOH, C3H7COOH
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