Q15 of 56 Page 118

Which of the following is not a straight chain hydrocarbon?

Mark the longest chain of the given compound. If no carbon atoms are remaining after marking the chain, then the compound is not branched. If one or more carbon atoms are not marked in the longest chain, then they are said to be branches.

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Carbon forms four covalent bonds by sharing its four valence electrons with four univalent atoms, e.g., hydrogen. After the formation of four bonds, carbon attains the electronic configuration of:

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The correct electron dot structure of a water molecule is:

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Which among the following are unsaturated hydrocarbons?

(i) H3C — CH2 — CH2 — CH3


(ii) H3C — C ≡ C — CH3


(iii)


(iv)

17

Pentane has the molecular formula C5H12. It has: