select the proper option and complete the statement:
(single, all, double, ionic, carbon, give and take, hydrogen, multiple bond, share, organic, covalent)
……….is the essential element in all the organic compounds.

………….is the essential element in all the organic compunds.

select the proper option and complete the statement: (single, all, double, ionic, carbon, give and take, hydrogen, multiple bond, share, organic, covalent) The element hydrogen is present in………..compound.

select the proper option and complete the statement: (single, all, double, ionic, carbon, give and take, hydrogen, multiple bond, share, organic, covalent) All the carbon bonds in a saturated hydrocarbon …….electron.

select the proper option and complete the statement: (single, all, double, ionic, carbon, give and take, hydrogen, multiple bond, share, organic, covalent) At least one carbon bond in an unsaturated hydrocarbon is………

select the proper option and complete the statement: (single, all, double, ionic, carbon, give and take, hydrogen, multiple bond, share, organic, covalent) A carbon atom forms a………bond with other atoms. In this bond the two atoms……….electrons.

Common element in all the organic compounds is _______.

Common element in all the organic compounds is ____________

Select the appropriate options and complete the following paragraph. (2, 7, 18, 32, atomic mass, atomic number, hydrogen, lithium) In the modern periodic table, all known elements are listed in increasing order of their _____ . It start with the lightest elements . The modern periodic table has ______ group and ____ preiods . The first period contains only ____ elements while the seventh period contains ______ elements .

Select the appropriate options and complete the following paragraph. (metals, nonmetals, metalloids, four, seven, s-block, p-block, d-block, f-block) On the basis of electronic configuration, elements in the modern periodic table are classified into ________ block. Groups 1 and 2 elements are included in _______ and all these elements are metals (except hydrogen). Group 13 to 18 elements are included in ________. This block contains metals, nonmetals and metalloids. Groups 3 to 12 elements are included in _______ and all these elements are _______. elements shown at the bottom of the periodic table i.e., Ianthanides and actinides constitute ______ and all these elements are metals.

Select the appropriate option and complete the following paragraph. (single, double, hydrocarbons, C_(2)H_(4), C_(2)H_(6), CHCl_(3), CH_(3)Cl, methane, ethane) Carbon compounds contain carbon and hydrogen as the only two elements are called __________. The smallest hydrocarbon is ________. Another hydrocarbon is ___________with molecular formula __________. In both these hydrocarbons, the valencies of all the atoms are satisfied by the _________ bonds. If one hydrogen atom of methane is replaced by another monovalent element chlorine, then a new carbon compounds is formed. The molecular formula of this compound is ___________.