The metallic sound produced by engine due to the pre-ignition of fuel is called _______________?

A. Knocking
B. Reforming
C. Cracking
D. A and c

Which of the following can be used as anti-knocking agent ?

A. Pbcl2
B. (c2h5)4 pb
C. (c2h5)2 pb
D. All of the above

Isomerism which is present only in alkene is__________________?

A. Structural isomerism
B. Metamerism
C. Cis-trans isomerism
D. Both b and c

Compound containing benzene ring in their structure are __________________?

A. Aliphatic
B. Aromatic
C. Carboxylic acid
D. Carbohydrates

Which of the following is an amide________________?

A. R-nh2
B. Rconh2
C. R – nh – r
D. C6h5nh2

Only sigma bonds are present in__________________?

A. Propene
B. Butanoic acid
C. Butanal
D. Ethoxy ethane

The structure of ethyne is_________________?

A. Angular
B. Trigonal
C. Linear
D. Trigonal planar

The general formula of cycloalkene is __________________?

A. Cnh2n
B. Cnh2n+2
C. Cnh2n-1
D. Cnh2n-2

C5H12 has the number of isomers ___________________?

A. One
B. Two
C. Three
D. Four

Octane number can be improved by________________?

A. Isomerization
B. Adding (c2h5)4 pb
C. Adding (ch3)4 pb
D. All