| What is meant by homologous series of carbon compounds? Classify the following carbon compounds into two homologous series and name them. |
| \[{{\mathbf{C}}_{\mathbf{3}}}{{\mathbf{H}}_{\mathbf{4}}}\mathbf{, }{{\mathbf{C}}_{\mathbf{3}}}{{\mathbf{H}}_{\mathbf{6}}}\mathbf{, }{{\mathbf{C}}_{\mathbf{4}}}{{\mathbf{H}}_{\mathbf{6}}}\mathbf{, }{{\mathbf{C}}_{\mathbf{4}}}{{\mathbf{H}}_{\mathbf{8}}}\mathbf{, }{{\mathbf{C}}_{\mathbf{5}}}{{\mathbf{H}}_{\mathbf{8}}}\mathbf{, }{{\mathbf{C}}_{\mathbf{5}}}{{\mathbf{H}}_{\mathbf{10}}}\]. |
| The elements \[_{\mathbf{4}}\mathbf{Be}{{\mathbf{,}}_{\mathbf{12}}}\mathbf{Mg}\] and \[_{\mathbf{20}}\mathbf{Ca,}\] each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case: |
| (a) In which group should they be? |
| (b) Which one of them is least reactive? |
| (c) Which one of them has the largest atomic size? |
| A pea plant with blue colour flower denoted by BB is cross-breed with a pea plant with white flower denoted by ww. |
| (a) What is the expected colour of the flowers in their \[{{\mathbf{F}}_{\mathbf{1}}}\] progeny? |
| (b) What will be the percentage of plants bearing white flower in \[{{\mathbf{F}}_{\mathbf{2}}}\] generation, when the flowers of \[{{\mathbf{F}}_{\mathbf{1}}}\] plants were selfed? |
| (c) State the expected ratio of the genotype BB and Bw in the \[{{\mathbf{F}}_{\mathbf{2}}}\] progeny. |
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