Question

Fill in the following blanks with suitable words
(a) The form of carbon which is known as black lead is ...........
(b) The form of carbon which is used as a lubricant at high temperature is .........
(c) Compounds of carbon with hydrogen alone are called ..........
(d) CnH2n is the general formula of .......... hydrocarbons.
(e) Hydrocarbons having the general formula CnH2n−2 are called ..........
(f) Ethene and ethyne are examples of ..... hydrocarbons.
(g) Ethyne has ......... carbon-hydrogen single bonds.
(h) Carbon compounds have usually ... melting points and boiling points because they are ...... in nature.
(i) The property of carbon atoms to form long chains in compounds is called ...........
(j) The general formula CnH2n for cycloalkanes is the same as that of ...........
(k) The IUPAC name of ethylene is .........
(l) The IUPAC name of acetylene is ............

Answer 1

Answer:

1) Graphite.

2)Graphite.

3)Question is wrong if it is with carbon and hydrogen then it is called Hydrocarbons.

4)double bond unsaturated hydrocarbons.

5)tripple bond unsaturated hydrocarbons.

6)unsaturated hydrocarbons.

7)tripple.

8)low,

9)catenation

11) ethyl alcohol, ethanol.

Explanation:

Answer 2

Compounds of carbon with hydrogen are HYDROCARBON

Explanation:

(a) The form of carbon which is known as black lead is GRAPHITE

(b) The form of carbon which is used as a lubricant at high temperature is GRAPHITE

(c) Compounds of carbon with hydrogen alone are called HYDROCARBON

(d) $C_nH_2_n$ is the general formula of ALKENE hydrocarbons.

(e) Hydrocarbons having the general formula CnH2n−2 are called ALKYNES

(f) Ethene and ethyne are examples of UNSATURATED hydrocarbons.

(g) Ethyne has 2 carbon-hydrogen single bonds.

(h) Carbon compounds have usually LOW melting points and boiling points because they are COVALENT in nature.

(i) The property of carbon atoms to form long chains in compounds is called CATENATION

(j) The general formula CnH2n for cycloalkanes is the same as that of ALKENES

(k) The IUPAC name of ethylene is ETHENE

(l) The IUPAC name of acetylene is ETHYNE