ECAT Pre Engineering Chemistry Chapter 19 MCQ Test With Answer

Which gas is used for welding purposes

• Butane A
• Nitrogen B
• Methane C
• Acetylene D

Which one of the following is (m-xylene)

• 1,2 dimethyl benzene A
• 1,3 dimethyl benzene B
• 1,5 dimethyl benzene C
• 1,4 dimethyl benzene D

A six membered ring containing one double bond called

• Cyclohexene A
• Cyclohexane B
• Cyclohexadiene C
• None D

B-B'-dichloroethyl sulphide is commonly known as

• Mustard gas A
• Laughing gas B
• Phosgene gas C
• Bio gas D

Benzene can be obtained by heating either benzoic acid with X or phenol with Y. X and Y are respectively

• Zinc dust and soda lime A
• Soda time and zinc dust B
• Zinc dust and sodium hydroxide C
• Soda lime and copper D

Mustard gas is a :

• Gas A
• Liquid B
• Solid C
• High boiling point D

Which one of the following gases is used for artificial ripening of fruits

• Ethane A
• Ethyne B
• Methane C
• Propane D

Alkynes are colourless & odouless except

• Acetylene A
• Propyne B
• Butyne C
• Pentyne D

The simplest and the parent members of aromatic hydrocarbon is

• Benzene A
• Toluene B
• Biphenyis C
• Naphthalene D

"Each different compound should have a different name" was published by IUPAC system of nomenclature in

• 1892 A
• 1830 B
• 1947 C
• 1979 D

Alkanes are generally not reactive towards acids, alkalis, oxidation or reuducing agents. They however undergo some reactions, which one is the reaction undergone by alkanes

• Elemination A
• Addition B
• Free radical substitution C
• Nucleophilic substation D

Ethylene decolorizes cold dilute solution of KMnO₄. This test is known as

• Colouration test A
• Baeyer's test B
• Silver mirror test C
• Ring test D

Hybridization in alkanes is:

• sp A
• sp² B
• sp³ C
• dsp² D

Most common reactions of benzene and its derivatives are

• electrophilic addition reactions A
• electrophilic substitution reactions B
• Nucleophilic addition reactions C
• Nucleophilic subtitution reactions D

Alkene general formula :

• C_nH_2n+2 A
• C_nH_2n B
• C_nH_2n-2 C
• C_nH_2n+1 D

The geometry of acetylene is

• Angular A
• Bent B
• Trigonal C
• Linear D

Which of the following is not aromatic hydrogencarbon

• Benzene A
• Naphthalene B
• Toluene C
• Cyclohexene D

The stability of acromatic compounds decreases with ------- in the no. of its resonance structure

• Decrease A
• Increase B
• Remain constant C
• Partially decreases D

The general formula of alkane is

• C_nH_2n+2 A
• C_nH_n B
• C_nH_2n C
• C₂H_2n-1 D

The addition of HBr is easiest with

• CH2 = CHCl A
• CICH = CHCl B
• CH3 - CH = CH2 C
• (CH3)2 C = CH2 D

A salt producing hydrocarbon among these compounds is

• Ehyne A
• Ethene B
• Methane C
• Ethane D

The temp. used for the hydrogenation of alkenes using Ni is

• 2000°C A
• 400°C B
• 200-- 300°C C
• 1000°C D

• 4-methyl pentene A
• 2-methyle-1-butene B
• 2-methyl propane C
• None of the above D

The four bonds of carbon in methane are directed towards the corners of

• Cube A
• Pentagon B
• Hexagon C
• Tetrahedron D

The reaction in which ketone is reduced to the alkane is called

• Kolb A
• Clemmensen B
• Cannizzaro C
• None D

Reaction of ethanes with KMnO₄ gives:

• Ozonide A
• Glyoxal B
• Glycol C
• Oxalic acid D

Vinyl acetylene combines with HCl to form:

• Polyacetylene A
• Benzene B
• Chloroprene C
• Divinyl acetylene D

The benzene molecule contains

• Three double bonds A
• Two double bonds B
• One double bonds C
• Delocalizedπ-electron charge D

Benzene reacts with ozone and gives

• Glycerin A
• Glyoxal B
• Maleic anhydride C
• Benzoic acid D

Alkanes are gases :

• C₁-C₄ A
• C₅-C₁₀ B
• C₁₁-C₁₅ C
• C₁₀-C₂₀ D