Replacement of hydrogen from first carbon atom of n-propane by CH3 gives ____.

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Replacement of hydrogen from first carbon atom of propane by CH3 gives n-butane. n-propane - CH3 - CH2 - CH3 Replacing hydrogen atom of first carbon atom - CH3 - CH2 - CH2 - CH3 n-butane - CH3 - CH2 - CH2 - CH3

The bond lengths of Ethane (I), Ethene (II), Ethyne (III) and Benzene (IV) follow the order ____ .

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The bond lengths of Ethane (I), Ethene (II), Ethyne (III) and Benzene (IV) follow the order I > IV > II > III. Bond length of sigma bond is greater than double bond which is greater than triple bond. The double and triple bonds have pi bonds with sigma and so due to the lateral overlap of p - orbitals, the bond length is shortened. But in benzene, though there are three single bonds and three double bonds alternately, all the bonds are of same length (which is in between a single bond length and double bond length).

Among the options given, the group of organic compounds is _____.

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Among the options given, the group of organic compounds is methane, urea and vinegar. Options A, B and C are all inorganic compounds, though they contain carbon atoms.

But-1-ene and 2-methylpropene exhibit ____.

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But-1-ene and 2-methylpropene exhibit chain isomerism. The structure of But-1-ene is CH3 - CH2 - CH = CH2The structure of 2-methylpropene is CH2 = C(CH3) - CH3 Both structures have the same molecular formula C4H8. The difference in the structure is due to the difference in the structure of the carbon chain.

Of the options given, ___________ has a bond formed by the overlap of sp3 - sp hybrid orbitals.

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CH3 -C has a bond formed by the overlap of sp3 - sp hybrid orbitals. Carbon in CH3 is sp3 hybrid orbital, carbon in CH2= CH is sp2 hybrid and carbon in CH ≡ CH is sp hybridised orbital.

____ chain isomers can be obtained from the alkane C6H14.

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Four chain isomers can be obtained from the alkane C6H14.

Of the following species, ____as a trigonal planar shape.

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The methyl radical, CH3+ has a trigonal planar shape. Option A - Ammonia has a pyramidal structure. Option C - Boron tetra fluoride ion has a tetrahedral structure. Option D - Silicon hydride has a tetrahedral structure.

In numbering the carbon chain, the ____ is numbered one.

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In numbering the carbon chain, the carboxylic carbon is numbered one. Example: In CH3COOH, C of COOH is C1 and C of CH3 is C2.

Of the compounds given, _____ has only one type of hybrid carbon.

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Of the compounds given, CH3 - CH2 - CH2 - CH3 has only one type of hybrid carbon. In option A, we have sp3and sp2 hybrid carbon atoms. In Option B, we have sp and sp3 hybrid carbon atoms. In option C, we have sp3 and sp carbon atoms

The common names of carboxylic acids end with the suffix ____acid and have been derived from Latin or Greek names of their ____sources.

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The common names of carboxylic acids end with the suffix -ic acid and have been derived from Latin or Greek names of their natural sources. Examples: Formic acid (HCOOH) was first obtained from red ants (Latin : formica means ant). Acetic acid (CH3COOH)from vinegar (Latin: acetum, means vinegar). Butyric acid (CH3CH2CH2COOH) from rancid butter (Latin : butyrum, means butter).

In the reaction, NH4Cl + KCNO → A ---- {Δ(heated)}- → B, the compounds A and B are ___________and _________ respectively .

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The compounds A and B are NH4CNO and NH2 CO NH2 respectively. In 1828, Wohler synthesised urea by reacting ammonium chloride and potassiumcyanate. They form an intermediate compound, ammonium cyanate, which on heating gives urea. NH4Cl + KCNO → NH4CNO ---- {Δ (heated)} - → NH2 CO NH2

The number of secondary and tertiary carbons in the structure given below is ____ and ____ respectively.

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The number of secondary and tertiary carbons in the structure is 2 and 1 respectively. Based upon the number of carbon atoms attached to a carbon atom, the carbon atom is termed as primary (1°), secondary (2°), tertiary (3°) or quaternary (4°). Carbon atoms attached to no other carbon atom, as in methane or to only one carbon atom, as in ethane is called primary carbon atom. Terminal carbon atoms are always primary. Carbon atom attached to two carbon atoms is known as secondary. Tertiary carbon is attached to three carbon atoms and neo or quaternary carbon is attached to four carbon atoms. Thus, the structure has 5 primary carbon atoms, 2 secondary carbon atoms, 1 tertiary carbon atom and 1 quaternary carbon atom.

The structures CH3COCH3 and CH2=CHOHCH3 represent _____________.

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The structures CH3COCH3 and CH2=CHOHCH3 represent keto-enol tautomerism. It is keto-enol tautomerism because of the exchange of proton with the double bond. Metamerism cannot occur in acetone. It occurs for higher ketones only or amines. Positional isomers are with the change of position of functional group within the carbon chain. Functional isomerism is when the functional group changes, e.g alcohol and ether, with the same molecular formula.

An alkene of molecular formula C5H10 may be ____ alkene.

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An alkene of molecular formula C5H10 may be monosubstituted, disubstituted and trisubstituted alkene. The structural formula is as follows: a) CH3 - CH2 - CH2 - CH = CH2 - monosubstituted b) CH3 - CH2 - CH = CH - CH3 - disubstituted C) CH3 - C(CH3) = CH - CH3 - trisubstituted In monosubstituted alkene, only one methyl group is there which can be substituted. In disubstituted alkene, there are two methyl groups which can be substituted. In trisubstituted alkene, there are three methyl groups which can be substituted.

An isomer of ethanol is ____.

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An isomer of ethanol is dimethyl ether. Ethanol has the molecular formula C2H6O. The isomer should be of the same formula, but the structure may be different. Dimethyl ether has the molecular formula C2H6O. Methanol has the molecular formula CH4O Diethyl ether has the molecular formula C4H10O Acetone has the molecular formula C3H6O So, option D is only the isomer of ethanol.

The carboxyl (-COOH) group consists of a ____ group attached to a ____ group; hence its name carboxyl.

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The carboxyl (-COOH) group consists of a carbonyl group attached to a hydroxyl group; hence its name carboxyl.

Formic acid (HCOOH) was first obtained from ____.

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Formic acid (HCOOH) was first obtained from red ants (Latin : formica means ant).

The reaction of decane on heating to 770 K giving octane and ethylene is ____.

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The reaction of decane on heating to 770 K giving octane and ethylene, is pyrolysis reaction. The process of decomposing higher hydrocarbons into lower hydrocarbons with low boiling points by strong heating is called pyrolysis or cracking. The process involves the cleavage of carbon-carbon and carbon-hydrogen bonds resulting in the formation of lower hydrocarbons. The reaction is as follows: CH3CH2CH2CH2CH2CH2CH2CH2CH2CH3 770 → C8H18 + CH2 = CH2

Vital force theory was propounded by ___________.

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Berzelius propounded in 1825 that organic compounds are influenced by a mysterious force by which they are formed in nature. This is called the vital force theory. However, the theory met a blow and was not accepted. In 1828, Wohler prepared the compound urea, by treating ammonium chloride with potassium thiocyanate. In 1845, Herman Kolbe prepared acetic acid in the lab. In 1856, Berthelol prepared methane.

Of the following alkenes, ____ has the maximum value of heat of hydrogenation.

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Ethene has the maximum value of heat of hydrogenation. The least substituted alkene is least stable and has the highest value of heat of hydrogenation. Propene CH3 - CH = CH2 and 1-Butene have one methyl group which can be substituted. Whereas, 2-Butene CH3 - CH = CH - CH3 has two methyl group which can be substituted. So, CH2 = CH2 (ethene) which is least substituted has maximum value of heat of hydrogenation.

Which is correct statement with respect to trans-isomer?

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Trans-isomer has a higher melting point than cis-isomer is the correct statement. Trans-isomer has a higher melting point than cis-isomer because its molecules are more closely packed in solid state due to symmetry. It may be noted that: 1. The cis-isomer is more polar than trans-isomer. 2. The cis-isomer has a greater boiling point than the trans-isomer. 3. The trans-isomer is more stable than cis-isomer. 4. The trans-isomer has higher melting point than the cis-isomer

HC ≡ C - CH = CH - CH3 has _______ sigma bonds and ____ pi bonds.

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HC ≡ C - CH = CH - CH3has 10 sigma bonds and 3 pi bonds. Sigma bonds are formed by the axial overlap of atomic orbitals and pi bonds are formed by lateral overlap. Sigma bonds exist independently and pi bonds exist with sigma bond only. Single bonds are all sigma bonds and double bonds contain one sigma and one pi bond and triple bonds contain one sigma and two pi bonds. So, the total number of sigma and pi bonds is 10 σ (sigma) and 3π (pi) bonds.

In IUPAC system, aliphatic carboxylic acids are named by replaced the ending ____ in the name of the corresponding alkaline with ____ acid.

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In IUPAC system, aliphatic carboxylic acids are named by replacing the ending -e in the name of the corresponding alkaline with -oic acid. Example: Butane to Butanoic acid (-e is replaced with -oic acid) Methane to methanoic acid (-e is replaced with - oic acid)

Some higher members of ____ carboxylic acids (C12 - C18) known as ____, occur in natural fats as esters of glycerol.

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Some higher members of aliphatic carboxylic acids (C12 - C18) known as fatty acids, occur in natural fats as esters of glycerol.

Acetic acid (CH3COOH) was obtained from ____.

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Acetic acid (CH3COOH) was obtained from vinegar (Latin: acetum, means vinegar).

ICSE Class 10th Chemistry 10 - Organic Chemistry MCQs
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