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You know it is neopentyl because it has 3 carbons branching off of from one carbon (giving it the neo) and there are a total of 5 carbons in the substituent (making it pentyl). In other problems it looks like a cross but it an also be drawn like this.
A neo group is a group that has three methyl groups at the end and AT LEAST five carbons total, ie there is a secondary carbon connecting the branching side chain to the main chain. A tert-butyl group is a branching side chain that contains three methyls at the end and connects to the main chain via the tertiary carbon (once it is bonded to the chain, it is quaternary). The tert-butyl group is a sub-class of the neo branching.
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