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) C_nH_2n is the general formula of .......... hydrocarbons.
(e) Hydrocarbons having the general formula C_nH_2n−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 C_nH_2n for cycloalkanes is the same as that of ...........
(k) The IUPAC name of ethylene is .........
(l) The IUPAC name of acetylene is ............

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Solution

(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 hydrocarbons.

(d) C_nH_2n is the general formula of alkene hydrocarbons.

(e) Hydrocarbons having the general formula C_nH_2n−2 are called alkynes.

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

(g) Ethyne has two 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 C_nH_2n 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.

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Similar questions

Q. 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)

C_{n} H_{2 n}

is the general formula of ___ hydrocarbons.
(e) Hydrocarbons having the general formula

C_{n} H_{2 n - 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

C_{n} H_{2 n}

for cycloalkanes is the same as that of ___
(k) The IUPAC name of ethylene is ___
(l) The IUPAC name of acetylene is ___

Q. (a) Draw the structural formula of a compound with two carbon atoms in each of the following cases:
(i) An alkane with a carbon to carbon single bond.
(ii) An alcohol containing two carbon atoms.
(iii) An unsaturated hydrocarbon with a carbon to carbon triple bond.

(b) Ethane, Ethene, Ethanoic acid, Ethyne, Ethanol
From the compounds given above, name:
(i) The compound with —OH as a part of its structure.
(ii) The compound with —COOH as a part of its structure.
(iii) Homologue of Homologous series with general formula C_nH_2n.

(a) Give the general name of the class of compounds having the general formula $C_{n} H_{2 n - 2} .$ Write the name of the first member of this homologous series.
(b) The general formula of a homologous series of carbon compounds is $C_{n} H_{2 n} .$ Write the molecular formulae of the second and fourth members of the series.
(c) Write the molecular formulae of the third and fifth members of homologous series of carbon compounds represented by the general formula $C_{n} H_{2 n + 2}$

Q. Rewrite the following choosing the correct word from each pair given in brackets:
The hydrocarbons containing at least one carbon to carbon _______________ (double/triple) bond are called __________ (alkenes/alkynes). They have the general formula

C_{n} H_{2 n}

. These were previously called ______________ (olefins/paraffins). When this compound is treated with ____________ (bromine/lime) water, decolourisation occurs because it is ____________ (saturated/unsaturated).

Q. Write the name and formula of the

2^{n d}

member of the series of the carbon compounds, whose general formula is

C_{n} H_{2 n}

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