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The structures of three hydrocarbons, X,...

The structures of three hydrocarbons, X, Y and Z are shown below:

By considering the following statements, identify the correct option.
1. X and Y are isomers.
2. X and Y have the same percentage composition by mass.
3. Y is the isomer of alkane having formula, `C_(5)H_(12)`.
4. Z has the same boiling point as n-butane.

A

1, 2 and 3

B

2 and 4

C

1 and 4

D

1, 3 and 4

Text Solution

Verified by Experts

The correct Answer is:
A
Statement 1: X and Y have the same molecular formula, `C_(5)H_(12)` but different structural formulae. X is a branched chain alkane `CH_(3) underset(CH_(3))underset(|)(CH)CH_(2)CH_(3)` and Y is the straight chain alkane `CH_(3)CH_(2)CH_(2)CH_(2)CH_(3)`.
Statement 2: Since X and Y have the same molecular formula, they must have the same percentage composition by mass.
Statement 3: Y is n-pentane. It is a structural isomer of pentane having formula `C_(5)H_(12)`.
Statement 4: Z is methylpropane. It is the isomer of butane. Isomers have different boiling points.
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