Why carbon forms covalent bond ?

A compound A (C_(2)H_(4)O_(2)) reacts with Na metal to form a compound 'B' and evolves a gas which burns with a pop sound. Compound 'A' on treatment with an alcohol 'C' in the presence of an acid forms a sweety smelling compound 'D' (C_(4)H_(8)O_(2)) . On addition of naoH to 'D' gives back B and C. Identify A,B,C and D. Write the reaction involved. OR (a) Explain why carbon forms covalent bond? Give two reasons for carbon forming a large number of compounds. (b) Explain the structure of ammonia molecule.

Why carbon froms covalent compounds whereas lead forms ionic compounds ?

Give reasons for the following: (a) Unsaturated hydrocarbons show addition reactions but not saturated hydrocarbons. (b) Carbon forms only covalent bonds.

PASSAGE-I : Diamond and graphite are two allotropic forms of carbon which are crystalline in nature. They differ physically but chemically they are similar. Diamond is the hardest crystalline form of carbon. In diamond each carbon atom is linked to four other carbon atoms by covalent bonds. In graphite, each carbon atom is linked to three other carbon atoms by covalent bond. Graphite is relatively soft and greasy. It is a good conductor or electricity. Which of the folowing types of forces bind together the carbon atoms in diamond?

PASSAGE-I : Diamond and graphite are two allotropic forms of carbon which are crystalline in nature. They differ physically but chemically they are similar. Diamond is the hardest crystalline form of carbon. In diamond each carbon atom is linked to four other carbon atoms by covalent bonds. In graphite, each carbon atom is linked to three other carbon atoms by covalent bond. Graphite is relatively soft and greasy. It is a good conductor or electricity. Which allotrope gives carbon dioxide on heating?

PASSAGE-I : Diamond and graphite are two allotropic forms of carbon which are crystalline in nature. They differ physically but chemically they are similar. Diamond is the hardest crystalline form of carbon. In diamond each carbon atom is linked to four other carbon atoms by covalent bonds. In graphite, each carbon atom is linked to three other carbon atoms by covalent bond. Graphite is relatively soft and greasy. It is a good conductor or electricity. Which of the following is a goos conductor of heat and electricity?

PASSAGE-I : Diamond and graphite are two allotropic forms of carbon which are crystalline in nature. They differ physically but chemically they are similar. Diamond is the hardest crystalline form of carbon. In diamond each carbon atom is linked to four other carbon atoms by covalent bonds. In graphite, each carbon atom is linked to three other carbon atoms by covalent bond. Graphite is relatively soft and greasy. It is a good conductor or electricity. Graphite is a good conductor of electricity because

Two types of carbon - carbon covalent bond lengths are present in