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How many monochloro isomers of 2-methylpropane are there?

Answer 1

Only two

If you look at the alkane, only the C-2 is different from the rest. You may see it as a #CH-#group with three equivalent #CH_3-#groups attached. So the single chloro may attach to the "central" C, or to one of the others.

Propane with one chloro 2-methyl and two chloro 2-methyl

The -2- may be omitted because the methyl group can only be joined to the C-2 of the propane main chain:

Propane with one or two chloromethyl groups

We renumber so that this becomes the C-1 and the original C-1 is now the methyl carbon if the chloro is on the 2-methyl group.

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Answer 2

Ruby Allen

There is only one monochloro isomer of 2-methylpropane.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.