The structures of four hydrocarbons are shown below:

How many isomers of butene are there?

1. 1
2. 2
3. 3
4. 4

Which of the following is the best reagent to distinguish between ethylene and acetylene ?

P — Bromine water

Q — Ammoniacal silver nitrate solution

R — Acidified potassium dichromate solution

1. Only P
2. Only Q
3. Both P and Q
4. Both Q and R

Assertion (A): Carbon shows catenation.

Reason (R): Catenation is the property of self linking by covalent bonds.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): Alkynes show addition reactions.

Reason (R): Alkanes show substitution reactions.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.